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Summary of Significant Accounting Policies | 12 Months Ended
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Sep. 30, 2022
Accounting Policies [Abstract] |
Summary of Significant Accounting Policies | 2. Summary of Significant Accounting Policies Principles of Consolidation and Basis of Presentation The accompanying Consolidated Financial Statements include the accounts of the Company and its majority-owned subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”). All intercompany balances and transactions have been eliminated in consolidation. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting period. Significant estimates are associated with recording accounts receivable, inventories, goodwill, intangible assets other than goodwill, long-lived assets, derivative financial instruments, deferred income taxes, revenue over time, and stock-based compensation expense. The Company assesses the estimates on an ongoing basis and records changes in estimates in the period they occur and become known. Actual results could differ from these estimates. The full extent to which the COVID-19 pandemic will directly or indirectly impact the Company’s business, including results of operations and financial condition, will depend on future developments that are highly uncertain. This includes results from new information that may emerge concerning COVID-19 and any actions taken to contain or treat COVID-19, as well as the economic impact on local, regional, national and international customers and markets. The Company has made estimates of the impact of COVID-19 within its financial statements and there may be changes to those estimates in future periods. Business Combinations The Company accounts for business acquisitions using the purchase method of accounting, in accordance with which assets acquired and liabilities assumed are recorded at their respective fair values at the acquisition date. The fair value of the consideration paid, including contingent consideration, is assigned to the assets acquired and liabilities assumed based on their respective fair values. Goodwill represents the excess of the purchase price over the estimated fair values of the assets acquired and liabilities assumed. Significant judgment is used in determining fair values of assets acquired and liabilities assumed and contingent consideration, as well as intangibles and their estimated useful lives. Fair value and useful life determinations may be based on, among other factors, estimates of future expected cash flows and appropriate discount rates used in computing present values. These judgments may materially impact the estimates used in allocating acquisition date fair values to assets acquired and liabilities assumed, as well as our current and future operating results. Actual results may vary from these estimates that may result in adjustments to goodwill and acquisition date fair values of assets and liabilities during a measurement period or upon a final determination of asset and liability fair values, whichever occurs first. Adjustments to fair values of assets and liabilities made after the end of the measurement period are recorded within our operating results. Changes in the fair value of contingent consideration resulting from a change in the underlying inputs are recognized in results of operations until the arrangement is settled. Foreign Currency Translation Certain transactions of the Company and its subsidiaries are denominated in currencies other than their functional currency. Foreign currency exchange gains (losses) generated from the settlement and remeasurement of these transactions are recognized in earnings and presented within “Other income (expenses), net” in the Company’s Consolidated Statements of Operations. Net foreign currency transaction and remeasurement losses totaled $1.7 million, $1.8 million and $3.4 million for the fiscal years ended September 30, 2022, 2021 and 2020, respectively. The determination of the functional currency of the Company’s subsidiaries is based on their financial and operational environment and is the local currency of all of the Company’s foreign subsidiaries. The subsidiaries’ assets and liabilities are translated into the reporting currency at period-end exchange rates, while revenue, expenses, gains and losses are translated at the average exchange rates during the period. Gains and losses from foreign currency translations are recorded in “Accumulated other comprehensive income” in the Company’s Consolidated Balance Sheets and presented as a component of comprehensive income in the Company’s Consolidated Statements of Comprehensive Income. The semiconductor automation business had foreign operations which had a cumulative translation adjustment balance of $16.6 million at the date of disposal of this business. This amount was removed from ‘Accumulated other comprehensive income” in the Company’s Consolidated Balance Sheet during the three months ended March 31, 2022, and included within the gain on the sale of the semiconductor automation business in “Income from discontinued operations, net of tax” in the Company’s Consolidated Statement of Operations. As a result, the Company presented a $16.6 million reclassification adjustment in “Accumulated other comprehensive income” in the Company’s Consolidated Balance Sheet at September 30, 2022. ​ Derivative Financial Instruments The Company has transactions and balances denominated in currencies other than the functional currency of the transacting entity. Most of these transactions carry foreign exchange risk are in Germany, the United Kingdom and China. The Company enters into foreign exchange contracts to reduce its exposure to currency fluctuations. The arrangements typically mature in three months or less and they do not qualify for hedge accounting. Net gains and losses related to these contracts are recorded as a component of “Other income (expenses), net” in the accompanying Consolidated Statements of Operations and are as follows for the fiscal years ended September 30, 2022, 2021 and 2020 (in thousands): ​
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​ | ​ | Fiscal Year Ended September 30,
​ |  | 2022 |  | 2021 |  | 2020
Realized gains (losses) on derivatives not designated as hedging instruments | ​ | $ | 991 | ​ | $ | (7,781) | ​ | $ | (2,671)
​ ​ The fair values of the forward contracts are recorded in the accompanying Consolidated Balance Sheets as “Prepaid expenses and other current assets” and “Accrued expenses and other current liabilities”. Foreign exchange contract assets and liabilities are measured and reported at fair value based on observable market inputs and classified within Level 2 of the fair value hierarchy described in fair value measurements in Footnote 19, due to a lack of an active market for these contracts. ​ Hedging Activities On February 1, 2022, the Company entered into a cross-currency swap agreement to hedge the variability of exchange rate impacts between the United States dollar and the Euro. Under the terms of the cross-currency swap agreement, the Company notionally exchanged approximately $1.03 billion for approximately €915 million at a weighted average interest rate of approximately 1.196%. The designated notional amount is $960 million and the actual interest rate is 1.283%. 1.283% was in the range of the market value for that day and is the true interest rate on the notional amount. This cross-currency swap agreement expires in February 2023. The Company has designated the cross-currency swap as a hedge of net investments against one of our Euro denominated subsidiaries which requires an exchange of the notional amounts at maturity. At the maturity of the cross currency-swap, the Company will deliver a notional amount of €852 million and receive a notional amount of $960 million at an exchange rate of 1.1261. ​ This cross-currency swap is marked to market at each reporting period, representing the fair values of the cross-currency swap and any changes in fair value are recognized as a component of “Accumulated other comprehensive items, net”, on the Consolidated Statements of Comprehensive Income. Interest accrued on the cross-currency swap is recorded within “Interest income” on the Consolidated Statements of Operations. For the fiscal year ended September 30, 2022, the Company recorded an unrealized gain in the derivative asset of $124.8 million, which is $93 million net of taxes, to “Accumulated other comprehensive income” and recorded “Interest income” of $8.2 million, on this instrument for fiscal year ended September 30, 2022. ​ All derivatives, whether designated as a hedging relationship or not, are recorded in the Consolidated Balance Sheets at fair value. The accounting for changes in fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, the Company must designate the hedging instrument as a fair value hedge, cash flow hedge or a hedge of a net investment in a foreign operation based on the exposure being hedged. Certain derivatives held by the Company are not designated as hedges but are used in managing exposure to changes in foreign exchange rates. A fair value hedge is a derivative instrument designated for the purpose of hedging the exposure to changes in fair value of an asset or a liability resulting from a particular risk. If the derivative is designated as a fair value hedge, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are both recognized in the results of operations and presented in the same caption in the Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income. A cash flow hedge is a derivative instrument designated for the purpose of hedging the exposure to variability in future cash flows resulting from a particular risk. If the derivative is designated as a cash flow hedge, the effective portions of changes in the fair value of the derivative are recorded in accumulated other comprehensive income and recognized in the results of operations when the hedged item affects earnings. Ineffective portions of changes in the fair value of cash flow hedges are recognized in the results of operations. A hedge of a net investment in a foreign operation is achieved through a derivative instrument designated for the purpose of hedging the exposure of changes in value of investments in foreign subsidiaries. If the derivative is designated as a hedge of a net investment in a foreign operation, the effective portions of changes in the fair value of the derivative are recorded in other comprehensive income as a part of the foreign currency translation adjustment. Ineffective portions of net investment hedges are recognized in the results of operations. For derivative instruments not designated as hedging instruments, changes in fair value are recognized in the Consolidated Statements of Operations as gains or losses consistent with the classification of the underlying risk. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash deposits and cash equivalents, marketable securities, derivative instruments and accounts receivable. All of the Company’s cash and cash equivalents, restricted cash, marketable securities and derivative instruments are maintained by major financial institutions. The Company invests cash not used in operations in investment grade, high credit quality securities in accordance with the Company’s investment policy which provides guidelines and limits regarding investments type, concentration, credit quality and maturity terms aimed at maintaining liquidity and reducing risk of capital loss. The Company regularly monitors the creditworthiness of its customers and believes that it has adequately provided for exposure to potential credit losses. The Company’s ten largest customers accounted for approximately 20%, 19% and 19% of its consolidated revenue for the fiscal years ended September 30, 2022, 2021 and 2020, respectively. No customers accounted for more than 10% of the Company’s consolidated revenue for fiscal years 2022, 2021 and 2020. Fair Value Measurements The Company measures certain financial assets and liabilities, including cash equivalents, available for sale securities, accounts receivable, accounts payable, and derivative instruments at fair value. FASB ASC 820, Fair Value Measurement and Disclosures, establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Available for sale securities and derivative instruments are measured at fair value based on quoted market prices or observable inputs other than quoted market prices for identical or similar assets or liabilities. The carrying amounts of cash equivalents, accounts receivable and accounts payable approximate their fair value due to their short-term nature. Cash and Cash Equivalents, and Restricted Cash Cash and cash equivalents consist of cash and highly liquid investments with original maturities of three months or less that are readily convertible to known amounts of cash. At September 30, 2022 and 2021, cash equivalents were $374.8 million and $0.1 million, respectively. Cash equivalents are reported at fair value. The Company classifies long-term restricted cash balances within “Other assets” on the accompanying Consolidated Balance Sheets based upon the term of the remaining restrictions. Accounts Receivable, Allowance for Expected Credit Losses Trade accounts receivable do not bear interest and are recorded at the invoiced amount. The Company maintains an allowance for expected credit losses representing its best estimate of expected credit losses related to its existing accounts receivable and their net realizable value. The Company determines the allowance based on a number of factors, including an evaluation of customer credit worthiness, the age of the outstanding receivables, economic trends, historical experience, and other information over the payment periods. The Company reviews and adjusts the allowance for expected credit losses on a quarterly basis. Accounts receivable balances are written off against the allowance for expected credit losses when the Company determines that the balances are not recoverable. Provisions for expected credit losses are recorded in “Selling, general and administrative” expenses in the Consolidated Statements of Operations. The Company does not have any off-balance-sheet credit exposure related to its customers. Inventories Inventories are stated at the lower of cost or net realizable value determined on a first-in, first-out basis and include the cost of materials, labor and manufacturing overhead. The Company reports inventories at their net realizable value and provides reserves for excess, obsolete or damaged inventory based on changes in customer demand, technology and other economic factors. Fixed Assets, Intangible Assets and Impairment of Long-lived Assets Property, plant and equipment are stated at cost, net of accumulated depreciation. Depreciation expense is computed based on the straight-line method and charged to results of operations to allocate the cost of the assets over their estimated useful lives, as follows: ​
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Buildings |  | 10 - 40 years
Computer equipment and software |  | 3 - 7 years
Machinery and equipment |  | 2 - 10 years
Furniture and fixtures |  | 3 - 10 years
​ ​ Leasehold improvements are amortized over the shorter of their estimated useful lives or the remaining terms of the respective leases. Equipment used for demonstrations to customers is included in machinery and equipment and depreciated over its estimated useful life. Repair and maintenance costs are expensed as incurred. The Company has developed software for internal use. Internal and external labor costs incurred during the application development stage of a project are capitalized. Costs incurred prior to application development and post implementation are expensed as incurred. Training and data conversion costs are expensed as incurred. As of September 30, 2022, and 2021, the Company had cumulative capitalized direct costs of $26.9 million and $22.7 million, respectively, associated with the development of software for its internal use. As of September 30, 2022, this balance included $8.6 million associated with software still in the development stage which are included within "Property, plant and equipment, net" in the accompanying Consolidated Balance Sheets. During fiscal year 2022, the Company capitalized direct costs of $4.2 million associated with the development of software for its internal use. Cost of disposed assets and the associated accumulated depreciation are derecognized upon their retirement or at the time of disposal, and the resulting gain or loss is included in the Company’s results of operations. The Company identified finite-lived intangible assets other than goodwill as a result of acquisitions. Finite-lived intangible assets are valued based on estimated future cash flows and amortized over their estimated useful lives based on methods that approximate the pattern in which the economic benefits are expected to be realized. Finite-lived intangibles assets and fixed assets are tested for impairment when indicators of impairment are present. For purposes of this test, long-lived assets are grouped with other assets and liabilities at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities. If the Company determines that indicators of potential impairment are present, it assesses the recoverability of long-lived asset group by comparing its undiscounted future cash flows to its carrying value. The future cash flow period is based on the future service life of the primary asset within the long-lived asset group. If the carrying value of the long-lived asset group exceeds its future cash flows, the Company determines fair values of the individual net assets within the long-lived asset group to assess potential impairment. If the aggregate fair values of the individual net assets of the group are less than their carrying values, an impairment loss is recognized for an amount in excess of the group’s aggregate carrying value over its fair value. The loss is allocated to the assets within the group based on their relative carrying values, with no asset reduced below its fair value. Finite-lived intangible assets are amortized over their useful lives, as follows: ​
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Trademarks |  | 3 - 13 years
Patents |  | 7 years
Completed technology |  | 7 - 20 years
Customer relationships |  | 6 - 14 years
​ ​ Leases The Company has operating leases for real estate and non-real estate and finance leases for non-real estate. The classification of a lease as operating or finance and the determination of the right-of-use asset (“ROU asset”) and lease liability are determined at lease inception. The ROU asset represents the Company’s right to use an underlying asset for the lease term and the lease liability represents the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the commencement date of the lease based on the present value of lease payments over the lease term. As most of the Company’s leases do not provide an implicit rate, an incremental borrowing rate is used based on the estimated rate of interest for collateralized borrowing over a similar term of the lease payments at commencement date. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the option will be exercised. Lease expense is recognized on a straight-line basis over the lease term. The Company’s lease agreements may contain lease and non-lease components. Non-lease components primarily include payments for maintenance and utilities. Fixed payments for non-lease components are combined with lease payments and accounted for as a single lease component which increases the amount of the ROU asset and liability. The ROU asset for operating leases is included within Other assets and the ROU asset for finance leases is included within “Property, plant, and equipment, net’ on the Consolidated Balance Sheets. The short-term lease liabilities for both operating leases and finance leases are included within ‘Accrued expenses and other current liabilities” on the Consolidated Balance Sheets. The long-term lease liabilities for operating leases and finance leases are included within ‘Long-term operating lease liabilities”, and “Other long-term liabilities”, respectively, on the Consolidated Balance Sheets. Goodwill Goodwill represents the excess of purchase price over the fair value of net tangible and identifiable intangible assets of the businesses acquired by the Company. Goodwill is tested for impairment annually or more often if impairment indicators are present at the reporting unit level. The Company has elected April 1st as its annual goodwill impairment assessment date. If the existence of events or circumstances indicates that it is more likely than not that fair values of the reporting units are below their carrying values, the Company performs additional impairment tests during interim periods to evaluate goodwill for impairment. Application of the goodwill impairment test requires significant judgment based on market and operational conditions at the time of the evaluation, including management’s best estimate of future business activity and the related estimates of future cash flows from the assets and the reporting units that include the associated goodwill. These periodic evaluations could cause management to conclude that impairment factors exist, requiring an adjustment of these assets to their then-current fair market values. Future business conditions and/or activity could differ materially from the projections made by management which could result in additional adjustments and impairment charges. The goodwill impairment test is performed at the reporting unit level. A reporting unit is either an operating segment or one level below it, which is referred to as a “component”. The level at which the impairment test is performed requires an assessment of whether the operations below an operating segment constitute a self-sustaining business, in which case testing is generally performed at this level. In accordance with ASC 350, Intangibles- Goodwill and Other (“ASC 350”), the Company first assesses qualitative factors to determine whether the existence of events or circumstances indicates that it is more likely than not that the fair value of a reporting unit is less than its carrying value. If the Company determines, based on this assessment, that it is more likely than not that the fair value of the reporting unit is less than its carrying value, it performs a quantitative goodwill impairment test by comparing the reporting unit’s fair value with its carrying value. An impairment loss is recognized for the amount by which the reporting unit’s carrying value exceeds its fair value, up to the total amount of goodwill allocated to the reporting unit. We determine fair values of our reporting units based on an income approach in accordance with the discounted cash flow method, or DCF Method. The DCF Method is based on projected future cash flows and terminal value estimates discounted to their present values. Terminal value represents a present value an investor would pay on the valuation date for the rights to the cash flows of the business for the years subsequent to the discrete cash flow projection period. We consider the DCF Method to be the most appropriate valuation technique since it is based on management’s long-term financial projections. In addition to determining the fair value of our reporting units based on the DCF Method, we also compare the aggregate values of our net corporate assets and reporting unit fair values to our overall market capitalization and use certain market-based valuation techniques to assess the reasonableness of the reporting unit fair values determined in accordance with the DCF Method. The key inputs used in the DCF Method include revenue growth rates, gross margin percentage, selling, general and administrative expense percentage and discount rates that are at or above our weighted-average cost of capital. We derive discount rates that are commensurate with the risks and uncertainties inherent in the respective reporting units and our internally developed projections of future cash flows. Application of the goodwill impairment test requires judgment based on market and operational conditions at the time of the evaluation, including management’s best estimates of the reporting unit’s future business activity and the related estimates and assumptions of future cash flows from the assets that include the associated goodwill. Different assumptions of revenue growth rates, gross margin percentage, selling, general and administrative expense percentage and the discount rate used in the DCF Method could result in different estimates of the reporting unit’s fair value as of each testing date. In the fourth quarter of 2022, the Company experienced a decline in its stock price resulting in the total market value of our shares of stock outstanding (our market capitalization), being less than the carrying value of its reporting units. Therefore, as of September 30, 2022, the Company assessed several events and circumstances that could affect the significant inputs used to determine the fair value of our reporting units, including the significance of the amount of excess fair value over carrying value, updates to operating margins and cash flows, and the overall change in the economic climate. The Company considered the decline in the market capitalization being less than the carrying value of its reporting units in its evaluation of goodwill impairment indicators and determined it appropriate to perform a quantitative assessment of both its reporting units as of September 30, 2022. The Company’s valuation was based on the DCF method described above. The Company concluded that there was no impairment, as the estimated fair value of the segments exceeded their carrying value. In the event the financial performance of either of the two segments does not meet our expectations in the future, The Company experiences a prolonged macro or market downturn, or there are other negative revisions to key assumptions, in the DCF Method, the Company may be required to perform additional impairment analyses and could be required to recognize a non-cash impairment charge. Warranty Obligations The Company offers warranties on the sales of certain of its products and records warranty obligations for estimated future claims at the time revenue is recognized. Warranty obligations are estimated based on historical experience and management’s estimate of the level of future claims. Revenue Recognition The Company generates revenue from the following sources: ​
| ● | Products, including sales of automated cold sample management systems, consumables, instruments, spare parts, and software.
| ● | Services, including repairs, upgrades, diagnostic support, installation, as well as biological sample services such as DNA sequencing, gene synthesis, molecular biology, bioinformatics, biological sample storage, sample acquisition and other support services.
The Company recognizes revenue for the transfer of such promised products or services to customers in an amount that reflects the consideration to which the Company expects to be entitled to in exchange for those products or services. Under ASC 606, Revenue from Contracts with Customers (“ASC 606”), revenue is recognized when or as the transfer of control of the underlying performance obligation occurs. To determine the amount of consideration the Company expects to be entitled to and whether transfer of control has occurred, the Company applies the following five-step model: ​
| ● | Identify the contract with a customer. Contracts are accounted for when approval and commitment has been received from both parties, the rights of each party are identified, payment terms are identified, the contract has commercial substance and collectability of the consideration to which the Company is entitled is probable. Contracts are generally evidenced through receipt of an approved purchase order or execution of a binding arrangement and can be both short and long-term. Long-term contracts within the segments relate to the sale of products with attached service-type warranty contracts that generally have a stated contract term that is greater than one year. Contracts may contain acceptance provisions where the Company is required to obtain technical acceptance from the customer upon completion of installation services and evidence of the system’s functional performance within the customer’s operating environment. The Company has concluded that acceptance criteria within its contracts can be objectively evaluated and will not impact the Company’s transfer of control assessment under ASC 606.
| ● | Identify the performance obligations in the contract. Performance obligations include the sale of products and services. Certain customer arrangements related to the sale of automated cold sample management systems generally include more than one performance obligation and may include a combination of goods and or services, such as products with installation services or service-type warranty obligations. These contracts include multiple promises and as a result, the Company is required to evaluate each promise and determine whether the promise qualifies as a performance obligation within the contract. Contracts may contain the option to acquire additional products or services at defined prices. The Company reviews the pricing of these options to determine whether the option would exist independently of the current contract. If the pricing of contract options provides a material right to the customer that it would not receive without entering into the current contract, the Company accounts for the option as a separate performance obligation.
| ● | Determine the transaction price. The transaction price of the Company’s contracts with its customer is generally fixed, based on the amounts to be contractually billed to the customer. Although uncommon, certain contracts may contain variable consideration in the form of customer allowances and rebates that consist
|  | primarily of retrospective volume-based discounts and other incentive programs. Variable consideration is estimated at contract inception and included in the transaction price if it is probable that a subsequent change in the estimate would not result in a significant revenue reversal. The period between transfer of control of the performance obligations within a customer contract and timing of payment is generally within one year. As a result, the Company’s contracts typically do not include significant financing components.
| ● | Allocate the transaction price to the performance obligations in the contract. For customer contracts that contain more than one performance obligation, the Company allocates the total transaction consideration to each performance obligation based on the relative stand-alone selling price of each performance obligation within the contract. The Company relies on either observable standalone sales or an expected cost-plus margin approach to determine the standalone selling price of offerings, depending on the nature of the performance obligation. Performance obligations whose standalone selling price is estimated using an expected cost-plus margin approach relate to the sale of customized automated cold sample management systems, services, and service-type warranties.
| ● | Recognize revenue when or as the Company satisfies a performance obligation. The Company satisfies its performance obligations by transferring a product or service either at a point in time or over time, when the transfer of control of the underlying performance obligation has occurred. Control is evidenced by the customer’s ability to direct the use of and obtain substantially all the remaining benefits from the performance obligation. Revenue from third-party sales for which the Company does not meet the criteria for gross revenue recognition is recognized on a net basis. All other revenue is recognized on a gross basis. The Company excludes from the transaction price all sales taxes assessed by governmental authorities and as a result, revenue is presented net of tax.
As a result of applying this five-step model under ASC 606, the Company recognizes revenues from its sale of products and services as follows: ​
| ● | Products: Revenue from the sale of standard products is recognized upon their transfer of control to the customer, which is considered complete at either the time of shipment or arrival at destination, based on the agreed upon terms within the contract. The Company’s payment terms for the sale of standard products are typically 30 to 60 days.
Revenue from the sales of certain products that involve significant customization, which include primarily automated cold sample management systems is recognized over time as the asset created by the Company’s performance does not have alternative use to the Company and an enforceable right to payment for performance completed to date is present. The Company recognizes revenue as work progresses based on a percentage of actual labor hours incurred on the project to-date and total estimated labor hours expected to be incurred on the project. The selection of the method to measure progress towards completion requires judgment. The Company has concluded that using the percentage of labor hours incurred to estimated labor hours needed to complete the project most appropriately depicts the Company’s efforts towards satisfaction of the performance obligation. The Company develops profit estimates for long-term contracts based on total revenue expected to be generated from the project and total costs anticipated to be incurred in the project. These estimates are based on a number of factors, including the degree of required product customization and the work required to be able to install the product in the customer’s existing environment, as well as the Company’s historical experience, project plans and an assessment of the risks and uncertainties inherent in the contract related to implementation delays or performance issues that may or may not be within the Company’s control. The Company estimates a loss on a contract by comparing total estimated contract revenue to the total estimated contract costs and recognizes a loss during the period in which it becomes probable and can be reasonably estimated. The Company reviews profit estimates for long-term contracts during each reporting period and revises the estimate based on changes in circumstances. Revenue for certain arrangements that involve significant product customization but do not provide the Company with an enforceable right to payment for performance completed to date are recognized at a point in time, upon completion or substantial completion of the project, provided transfer of control has occurred. The project is considered substantially complete when the Company receives acceptance from the customer and remaining tasks are perfunctory or inconsequential and in control of the Company. Generally, the terms of long-term contracts provide for progress billings based on completion of milestones or other defined phases of work. In certain instances, payments collected from customers in advance of recognizing the related revenue are recorded and presented as contract liabilities within “Deferred revenue” on the Company’s Consolidated Balance Sheet. Additionally, due to certain billing constraints within contracts, the customer may retain a portion of the contract price until completion of the contract. In these contracts, an unbilled receivable is recorded when revenue recognized may exceed billings, which the Company presents as a contract asset on the balance sheet, which is included within the “Prepaid expenses and other current assets” on the Company’s Consolidated Balance Sheet.
| ● | Services: Service revenue is generally recognized ratably over time or on an output method, as the customer simultaneously receives and consumes the benefit of these services as they are performed. Payments related to service-type warranties may be made up front or proportionally over the contract term. Revenue for sample management and storage are recognized over the period the services are rendered or samples are stored. Payment due or received from the customers prior to rendering the associated services are recorded as a contract liability.
| ● | Genomic Services: The Company’s genomic services are professional services which includes Sanger sequencing, Next Generation sequencing, gene synthesis and gene editing-CRISPR based gene editing. Revenue from genomic services is recognized over time and is based upon the fact that transfer of control takes place over time as determined using the input method of costs incurred.
Research and Development Expense Research and development costs are expensed as incurred. Research and development costs consist primarily of personnel expenses related to development of new products, as well as enhancements and engineering changes to existing products and development of hardware and software components. Stock-Based Compensation Expense The Company measures stock-based compensation cost at fair value on the grant date and recognizes the expense over the service period for the awards expected to vest. The fair value of restricted stock units is determined based on the number of shares granted and the closing price of the Company’s common stock quoted on the Nasdaq Global Select Market on the date of grant. For awards that vest based on service conditions, the Company recognizes stock-based compensation expense on a straight-line basis over the requisite service period. For awards that vest subject to performance conditions, the Company recognizes stock-based compensation expense ratably over the performance period if it is probable that performance condition will be met and adjusted for the percentage of shares probable of achieving the performance goals. Each quarter, the Company assesses the probability of achieving the performance goals. Current estimates may differ from actual results and future changes in estimates. The Company makes estimates of stock award forfeitures and the number of awards expected to vest. The Company considers many factors in developing forfeiture estimates, including award types, employee classes and historical experience. The following table reflects stock-based compensation expense, excluding amounts related to discontinued operations, recorded during the fiscal years ended September 30, 2022, 2021 and 2020 (in thousands): ​
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​ | ​ | Year Ended September 30,
​ |  | 2022 |  | 2021 |  | 2020
Restricted stock units | ​ | $ | 10,597 | ​ | $ | 18,923 | ​ | $ | 9,907
Employee stock purchase plan | ​ |  | 1,846 | ​ |  | 1,128 | ​ |  | 744
Total stock-based compensation expense | ​ | $ | 12,443 | ​ | $ | 20,051 | ​ | $ | 10,651
​ ​ Valuation Assumptions for an Employee Stock Purchase Plan The fair value of shares issued under the employee stock purchase plan is estimated on the commencement date of each offering period using the Black-Scholes option-pricing model with the following weighted average assumptions for the fiscal years ended September 30, 2022, 2021 and 2020: ​
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​ | ​ | Year Ended September 30, |
​ |  | 2022 |  | 2021 |  | 2020 |
Risk-free interest rate |  | 1.7 | % | 0.3 | % | 0.9 | %
Volatility |  | 49 | % | 53 | % | 58 | %
Expected life |  | 6 months |  | 6 months |  | 6 months |
Dividend yield |  | — | % | 0.6 | % | 1.1 | %
​ ​ The risk-free rate is based on the U.S. Treasury yield curve for notes with terms approximating the expected life of the shares granted. The expected stock price volatility is determined based on the Company’s historic stock prices over a period commensurate with the expected life of the shares granted. The expected life represents the weighted average period over which the shares are expected to be purchased. Dividend yields are projected based on the Company’s history of dividend declarations and management’s intention for future dividend declarations. Income Taxes The Company records income taxes using the asset and liability method. Deferred income tax assets and liabilities are recognized for the future tax differences between the financial statement carrying amounts of existing assets and liabilities and their respective income tax bases, as well as operating loss and tax credit carryforwards. The Company’s Consolidated Financial Statements contain certain deferred tax assets that were recorded as a result of operating losses, as well as other temporary differences between financial and tax accounting. A valuation allowance is established against deferred tax assets if, based upon the evaluation of positive and negative evidence and the extent to which that evidence is objectively verifiable, it is more likely than not that some or all of the deferred tax assets will not be realized. Significant management judgment is required in determining the Company’s income tax provision, the Company’s deferred tax assets and liabilities and any valuation allowance recorded against those net deferred tax assets. The Company evaluates the weight of all available evidence to determine whether it is more likely than not that some portion or all of the net deferred income tax assets will not be realized. The calculation of the Company’s income tax liabilities involves consideration of uncertainties in the application of complex tax regulations. The Company recognizes liabilities for uncertain tax positions based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained upon an audit conducted by taxing authorities, including resolution of related appeals or litigation processes, if any. If the Company determines that a tax position will more likely than not be sustained, the second step requires the Company to estimate and measure the tax benefit as the largest amount that is more likely than not to be realized upon ultimate settlement. It is inherently difficult and subjective to estimate such amounts, as the Company must determine the probability of various possible outcomes. The Company re-evaluates these uncertain tax positions on a quarterly basis. This evaluation is based on factors, such as changes in facts or circumstances, tax law, new audit activity and effectively settled issues. Determining whether an uncertain tax position is effectively settled requires judgment. A change in recognition or measurement may result in the recognition of a tax benefit or an additional charge to the tax provision. Earnings Per Share Basic income or loss per share is determined by dividing net income by the weighted average common shares outstanding during the period. Diluted income or loss per share is determined by dividing net income by diluted weighted average shares outstanding during the period. Diluted weighted average shares reflect the dilutive effect, if any, of potential common shares. To the extent their effect is dilutive, employee equity awards and other commitments to be settled in common stock are included in the calculation of diluted income or loss per share based on the treasury stock method. Potential common shares are excluded from the calculation of dilutive weighted average shares outstanding if their effect would be anti-dilutive at the balance sheet date based on a treasury stock method or due to a net loss. Recently Issued Accounting Pronouncements In November 2021, the FASB issued Accounting Standards Update (“ASU”) 2021-10, Government Assistance (Topic 832) – Disclosures by Business Entities about Government Assistance. The amendment in this ASU requires disclosures to increase the transparency of transactions with a government accounted for by applying a grant or contribution accounting model by analogy, including (1) the types of transactions, (2) the accounting for those transactions, and (3) the effect of those transactions on an entity’s financial statements. This ASU is effective for annual periods beginning after December 15, 2021. The Company will adopt the provisions of this ASU in fiscal year 2023. The Company is evaluating the effect of adopting this new accounting guidance. ​ Recently Adopted Accounting Pronouncements In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. ASU 2021-08 requires an entity to recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with ASC 606. Under current GAAP, an acquirer generally recognizes such items at fair value on the acquisition date. The ASU is effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. Early adoption is permitted. The standard should be applied prospectively to business combinations occurring on or after the effective date of the amendments. The Company adopted the guidance during the first quarter of fiscal year 2022. The impact of the adoption of this ASU is immaterial to the Company’s consolidated financial statements. In October 2020, the FASB issued “ASU” 2020-10, Codification Improvements. The amendments in this ASU represent changes to clarify certain ASCs, correct unintended application of guidance, or make minor improvements to certain ASCs that are not expected to have a significant effect on current accounting practice or create a significant administrative cost to most entities. ASU 2020-10 is effective for annual periods beginning after December 15, 2020 and interim periods within those annual periods, with early adoption permitted. The amendments in this ASU should be applied retrospectively. This ASU did not affect the Company's consolidated financial statements or disclosures. The Company adopted the provisions of this ASU in the first quarter of fiscal 2022. ​ In March 2020, the FASB issued ASU 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope. The ASUs provide temporary optional expedients and exceptions to the GAAP guidance on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate (LIBOR) and other interbank offered rates to alternative reference rates. The provisions of the ASUs are only available until December 31, 2022, when the reference rate replacement activity is expected to be completed. There is no significant accounting impact on the Company’s consolidated financial statements and related disclosures as a result of the adoption of this ASU. ​ In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes (Topic 740), which removes certain exceptions to the general principles in ASC Topic 740, Income Taxes (“ASC Topic 740”), and improves consistent application of and simplifies GAAP for other areas of Topic 740 clarifying and amending existing guidance. This ASU is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2020. The Company adopted the provisions of this ASU in the first quarter of fiscal 2022. There is no significant accounting impact on the Company’s consolidated financial statements and related disclosures as a result of the adoption of this ASU. ​ In August 2018, the FASB issued ASU 2018-14, Disclosure Framework — Changes to the Disclosure Requirements for Defined Benefit Plans, which amends ASC 715 to add, remove, and clarify disclosure requirements related to defined benefit pension and other postretirement plans. The amendments require additional disclosure for the weighted-average interest crediting rates, a narrative description of the reasons for significant gains and losses, and an explanation of any other significant changes in the benefit obligation or plan assets. The amendment removes disclosure requirements for accumulated other comprehensive income expected to be recognized over the next year, information about plan assets to be returned to the entity, and the effects of a one-percentage-point change on the assumed health care costs and the effect of this change in rates on service cost, interest cost, and the benefit obligation for postretirement health care benefits. The ASU is effective for fiscal years ending after December 15, 2020. Early adoption is permitted. The ASU does not amend the interim disclosure requirements of ASC 715-20. The Company adopted the provisions of this ASU in the first quarter of fiscal 2022. There is no significant accounting impact on the Company’s consolidated financial statements and related disclosures as a result of the adoption of this ASU. In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes (Topic 740), which removes certain exceptions to the general principles in Topic 740 and improves consistent application of and simplifies GAAP for other areas of Topic 740 clarifying and amending existing guidance. This ASU is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2020. Early adoption is permitted. The Company adopted the provisions of this ASU in the first quarter of fiscal 2022. There is no significant accounting impact on the Company’s consolidated financial statements and related disclosures as a result of the adoption of this ASU. ​ ​

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