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Summary of Significant Accounting Policies (Policies) | 6 Months Ended
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Jun. 30, 2020
Accounting Policies [Abstract] |
Fair Value Measurements | Fair Value Measurements - The Company categorizes its financial assets and liabilities measured and reported at fair value in the financial statements on a recurring basis based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels, which are directly related to the amount of subjectivity associated with the inputs used to determine the fair value of financial assets and liabilities, are as follows: •Level 1 — Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date. •Level 2 — Inputs (other than quoted prices included in Level 1) are either directly or indirectly observable for the assets or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life. •Level 3 — Inputs reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model. Each major category of financial assets and liabilities measured at fair value on a recurring basis is categorized based upon the lowest level of significant input to the valuations. The fair value hierarchy also requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Financial instruments in Level 1 generally include US treasuries and mutual funds listed in active markets. The Company's only financial assets and liabilities which were measured at fair value as of June 30, 2020 and December 31, 2019 were Level 1 assets comprised of cash and cash equivalents. The Company's cash and cash equivalents permit daily redemption and the fair values of these investments are based upon the quoted prices in active markets provided by the holding financial institutions. The following table shows assets and liabilities that are measured at fair value on a recurring basis and their carrying value (in millions):
| As of June 30, 2020 |  |  |  |  |  |
|  |  | Fair Value |  |  |  |
| Carrying Value |  | Level 1 |  | Level 2 |  | Level 3
Cash and cash equivalents | $ | 641.9 |  |  | $ | 641.9 |  |  | $ | — |  |  | $ | — |
| As of December 31, 2019 |  |  |  |  |  |
|  |  | Fair Value |  |  |  |
| Carrying Value |  | Level 1 |  | Level 2 |  | Level 3
Cash and cash equivalents | $ | 487.4 |  |  | $ | 487.4 |  |  | $ | — |  |  | $ | — |
The Company recognizes transfers between levels within the fair value hierarchy, if any, at the end of each quarter. There were no transfers in or out of Level 1, Level 2 or Level 3 during the six months ended June 30, 2020 and 2019, respectively. As of June 30, 2020 and December 31, 2019, the Company held no securities that were in an unrealized gain or loss position. The Company reviews the status of each security quarterly to determine whether an other-than-temporary impairment has occurred. In making its determination, the Company considers a number of factors, including: (1) the significance of the decline; (2) whether the securities were rated below investment grade; (3) how long the securities have been in an unrealized loss position; and (4) the Company's ability and intent to retain the investment for a sufficient period of time for it to recover.
Net Loss Per Share | Net Loss Per Share - Basic net loss per share is computed by dividing net loss by the weighted average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing net loss by the weighted average number of common shares and other dilutive securities outstanding during the period. Potentially dilutive securities from stock options, restricted stock, restricted stock units (RSUs) and convertible debt securities would be anti-dilutive as the Company incurred a net loss. Potentially dilutive common shares resulting from the assumed exercise of outstanding stock options and from the assumed conversion of the Convertible Notes are determined based on the treasury stock method. The following table sets forth the reconciliation of the weighted average number of common shares used to compute basic and diluted net loss per share for the three and six months ended June 30, 2020 and 2019:
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
| (in thousands, except per share amounts) |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |
Net loss | $ | (61,854) |  |  | $ | (66,514) |  |  | $ | (128,218) |  |  | $ | (140,667) |
Denominator: |  |  |  |  |  |  |
Weighted average common shares used in calculation of basic net loss per share: | 96,633 |  |  | 81,806 |  |  | 93,206 |  |  | 79,685 |
Effect of dilutive securities: |  |  |  |  |  |  |
Common stock options | — |  |  | — |  |  | — |  |  | — |
Restricted stock and RSUs | — |  |  | — |  |  | — |  |  | — |
Convertible debt securities | — |  |  | — |  |  | — |  |  | — |
Weighted average common shares outstanding used in calculation of diluted net loss per share | 96,633 |  |  | 81,806 |  |  | 93,206 |  |  | 79,685 |
Net loss per share: |  |  |  |  |  |  |
Basic and diluted | $ | (0.64) |  |  | $ | (0.81) |  |  | $ | (1.38) |  |  | $ | (1.77) |
The following potentially dilutive securities have been excluded from the computations of diluted weighted average common shares outstanding as of June 30, 2020 and 2019 as their effect would have been anti-dilutive (in thousands):
| As of June 30, |  |
| 2020 |  | 2019
Common stock options | 13,272 |  |  | 11,034 |
Unvested restricted stock and RSUs | 868 |  |  | 475 |
Convertible debt securities | 11,492 |  |  | 11,492 |
Concentration of Credit Risk | Concentration of Credit Risk—Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents. The Company places its cash equivalents with high credit-quality financial institutions and may invest its short-term investments in US treasury securities, mutual funds and government agency bonds. The Company has established guidelines relative to credit ratings and maturities that seek to maintain safety and liquidity. The Company is exposed to risks associated with extending credit to customers related to the sale of products. The Company does not require collateral to secure amounts due from its customers. The Company uses an expected loss methodology to calculate allowances for trade receivables. The Company's measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The Company does not currently have a material allowance for collectible trade receivables. The following table presents the percentage of gross product revenue represented by the Company's three largest customers as of the six months ended June 30, 2020 and June 30, 2019.
| Percentage of Total Gross Product Revenue |  |  |  |  |  |
| June 30, 2020 |  | June 30, 2019 |  |  |  |
Customer A | 28% |  | 31% |  |  |  |
Customer B | 26% |  | 18% |  |  |  |
Customer C | 24% |  | 30% |  |  |  |
The Company relies on third-party manufacturers and suppliers for manufacturing and supply of its products. The inability of the suppliers or manufacturers to fulfill supply requirements of the Company could materially impact future operating results. A change in the relationship with the suppliers or manufacturer, or an adverse change in their business, could materially impact future operating results.
Revenue Recognition | Revenue Recognition—In accordance with Accounting Standards Codification (ASC) 606, Revenue from Contracts with Customers, the Company recognizes revenue when a customer obtains control of promised goods or services, in an amount that reflects the consideration the Company expects to receive in exchange for the goods or services provided. To determine revenue recognition for arrangements within the scope of ASC 606, the Company performs the following five steps: (1) identify the contracts with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when or as the entity satisfies a performance obligation. At contract inception, the Company assesses the goods or services promised within each contract and determines those that are performance obligations and assesses whether each promised good or service is distinct. The Company then recognizes as revenue the amount of the transaction price that is allocated to the respective performance obligation when or as the performance obligation is satisfied. For all contracts that fall into the scope of ASC 606, the Company has identified one performance obligation: the sale of ARIKAYCE to its customers. The Company has not incurred or capitalized any incremental costs associated with obtaining contracts with customers. Product revenues consist primarily of sales of ARIKAYCE in the US. Product revenues are recognized once the Company performs and satisfies all five steps mentioned above. The Company's customers in the US include specialty pharmacies and specialty distributors. Revenue is recorded at net selling price (transaction price), which includes estimates of variable consideration for which reserves are established for (a) customer credits, such as invoice discounts for prompt pay and specialty pharmacies fees, (b) estimated government rebates, such as Medicaid and Medicare Part D reimbursements, and estimated managed care rebates, (c) estimated chargebacks, and (d) estimated costs of co-payment assistance. These reserves are based on the amounts earned or to be claimed on the related sales and are classified as reductions of accounts receivable (prompt pay discounts and chargebacks), prepaid expenses (co-payment assistance), or as a current liability (rebates). Where appropriate, these estimates take into consideration a range of possible outcomes which are probability-weighted for relevant factors such as the Company's historical experience, current contractual and statutory requirements, and forecasted customer buying and payment patterns. Overall, these reserves reflect the Company's best estimates of the amount of consideration to which it is entitled based on the terms of the applicable contract. The amount of variable consideration included in the transaction price may be constrained and is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. Actual amounts of consideration ultimately received may differ from the Company's estimates. If actual results in the future vary from estimates, the Company adjusts these estimates, which would affect net product revenue and earnings in the period such variances become known. Customer credits: The Company's customers are offered various forms of consideration, including fees for enhanced services and prompt payment discounts. The payment terms for sales to specialty pharmacies for prompt payment discounts and fees for services are based on contractual rates agreed with the respective specialty pharmacies. The Company anticipates that its customers will earn these discounts and fees and, therefore, deducts the full amount of these discounts and fees from total gross product revenues at the time such revenues are recognized. Rebates: The Company contracts with government agencies and managed care organizations or collectively, third-party payors, so that ARIKAYCE will be eligible for purchase by, or partial or full reimbursement from, such third-party payors. The Company estimates the rebates it will provide to third-party payors and deducts these estimated amounts from total gross product revenues at the time the revenues are recognized. These reserves are recorded in the same period in which the revenue is recognized, resulting in a reduction of product revenue and the establishment of a current liability. The current liability is included in accrued expenses on the consolidated balance sheets. The Company estimates the rebates that it will provide to third-party payors based upon (i) the Company's contracts with these third-party payors, (ii) the government mandated discounts applicable to government-funded programs, (iii) a range of possible outcomes that are probability-weighted for the estimated payor mix, and (iv) information obtained from the Company's specialty pharmacies. Chargebacks: Chargebacks are discounts that occur when certain contracted customers, currently public health service institutions and federal government entities purchasing via the Federal Supply Schedule, purchase directly from the Company's specialty distributor. Contracted customers generally purchase the product at a discounted price and the specialty distributor, in turn, charges back to the Company the difference between the price the specialty distributor initially paid and the discounted price paid by the contracted customers. The Company estimates chargebacks provided to the specialty distributor and deducts these estimated amounts from gross product revenues, and from accounts receivable, at the time revenues are recognized. Co-payment assistance: Patients who have commercial insurance and meet certain eligibility requirements may receive co-payment assistance. Based upon the terms of the program and information regarding programs provided for similar specialty pharmaceutical products, the Company estimates the average co-pay mitigation amounts and the percentage of patients that it expects to participate in the program in order to establish accruals for co-payment assistance. These reserves are recorded in the same period in which the related revenue is recognized, resulting in a reduction of product revenue. The Company adjusts its accruals for co-pay assistance based on actual redemption activity and estimates of future redemptions related to sales in the current period. If any, or all, of the Company's actual experience varies from the estimates above, the Company may need to adjust prior period accruals, affecting revenue in the period of adjustment. The Company also recognizes revenue related to early access programs (EAPs) in Europe, consisting of sales to the French National Agency for Medicines and Health Products Safety, which granted ARIKAYCE a Temporary Authorization for Use (Autorisation Temporaire d'Utilisation or ATU) and from the named patient program in Germany and other countries. EAPs are intended to make products available on a named patient basis before they are commercially available in accordance with local regulations.
Inventory and Cost of product revenues (excluding amortization of intangible assets) | Inventory and Cost of Product Revenues (excluding amortization of intangible assets) - Inventory is stated at the lower of cost and net realizable value. The Company began capitalizing inventory costs following FDA approval of ARIKAYCE in September 2018. Inventory is sold on a first-in, first-out (FIFO) basis. The Company periodically reviews inventory for expiry and obsolescence and, if necessary, writes down accordingly. If quality specifications are not met during the manufacturing process, such inventory is written off to cost of product revenues (excluding amortization of intangible assets) in the period identified. Cost of product revenues (excluding amortization of intangible assets) consist primarily of direct and indirect costs related to the manufacturing of ARIKAYCE sold, including third-party manufacturing costs, packaging services, freight, and allocation of overhead costs, in addition to royalty expenses and revenue-based milestone payments. Cost is determined using a standard cost method, which approximates actual cost, and assumes a FIFO flow of goods. Prior to FDA approval of ARIKAYCE, the Company expensed all inventory related costs in the period incurred. Inventory used for clinical development purposes is expensed to research and development (R&D) expense when consumed.
Leases | Leases - In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) in order to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previous generally accepted accounting principles. ASU 2016-02 requires a lessee to recognize a liability to make lease payments (the lease liability) and a right-of-use (ROU) asset representing its right to use the underlying asset for the lease term on the balance sheet. A lease is a contract, or part of a contract, that conveys the right to control the use of explicitly or implicitly identified property, plant or equipment in exchange for consideration. Control of an asset is conveyed to the Company if the Company obtains the right to obtain substantially all of the economic benefits of the asset or the right to direct the use of the asset. The Company recognizes ROU assets and lease liabilities at the lease commencement date based on the present value of future, fixed lease payments over the term of the arrangement. ROU assets are amortized on a straight-line basis over the term of the lease or are amortized based on consumption, if this approach is more representative of the pattern in which benefit is expected to be derived from the underlying asset. Lease liabilities accrete to yield and are reduced at the time when the lease payment is payable to the vendor. Variable lease payments are recognized at the time when the event giving rise to the payment occurs and are recognized in the statement of comprehensive income in the same line item as expenses arising from fixed lease payments. In accordance with Topic 842, leases are measured at present value using the rate implicit in the lease or, if the implicit rate is not determinable, the lessee's implicit borrowing rate. As the implicit rate is not typically available, the Company uses its implicit borrowing rate based on the information available at the lease commencement date to determine the present value of future lease payments. The implicit borrowing rate approximates the rate the Company would pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments. Refer to Note 7 - Leases for details about the Company's lease portfolio, including Topic 842 required disclosures.
Recently Adopted Accounting Pronouncements | Recently Adopted Accounting Pronouncements - In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses which requires financial assets measured at an amortized cost basis to be presented at the net amount expected to be collected. This ASU amends the impairment model to utilize an expected loss methodology in place of the incurred loss methodology for financial instruments, including trade receivables. The Company's measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The Company adopted ASU 2016-13 effective January 1, 2020. Different aspects of the guidance required modified retrospective or prospective adoption. Adoption of the standard did not have a material impact on the Company's consolidated financial statements.

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