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Significant Accounting Policies (Policies)
12 Months Ended
Mar. 31, 2021
Accounting Policies [Abstract]  
Basis of Accounting, Policy [Policy Text Block]
Basis of Consolidation
 
The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions are eliminated. Certain reclassifications of prior year amounts have been made to conform to the current year presentation. These reclassifications had
no
effect on net income, cash flows from operating activities or stockholders' equity.
Use of Estimates, Policy [Policy Text Block]
Use of Estimates
 
The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. The Company bases its estimates on historical experience and various other factors believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are
not
readily apparent from other sources. On an ongoing basis, the Company evaluates its estimates, including those related to revenue recognition, collectability of receivables, realizability of inventory, goodwill and intangible assets, contingent consideration, warranty provisions, stock-based compensation, tax reserves, and deferred tax assets. Provisions for depreciation are based on their estimated useful lives using the straight-line method. Some of these estimates can be subjective and complex and, consequently, actual results
may
differ from these estimates under different assumptions or conditions. While for any given estimate or assumption made by the Company's management there
may
be other estimates or assumptions that are reasonable, the Company believes that, given the current facts and circumstances, it is unlikely that applying any such other reasonable estimate or assumption would materially impact the financial statements.
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash Equivalents
 
Cash equivalents consist of highly liquid instruments with maturities of
three
months or less that are regarded as high quality, low risk investments and are measured using such inputs as quoted prices, and are classified within Level
1
of the valuation hierarchy. Cash equivalents consist principally of certificates of deposits and money market accounts.
Marketable Securities, Policy [Policy Text Block]
Marketable Securities
 
Marketable securities consist of certificates of deposit with maturities of less than
12
months that are measured using such inputs as quoted prices and are classified within Level
1
of the valuation hierarchy. The Company determines the appropriate classification of its marketable securities at the time of purchase and re-evaluates such classification as of each balance sheet date.  All marketable securities are considered available for sale and are carried at fair value.   Changes in fair value are recorded to other income (expense), net.  The Company periodically reviews the realizability of each short and long term marketable security when impairment indicators exist with respect to the security.  If other than temporary impairment of value of the security exists, the carrying value of the security is written down to its estimated fair value.
Receivable [Policy Text Block]
Accounts Receivable
 
Accounts receivable consist of amounts owed by commercial companies and government agencies. Accounts receivable are stated net of allowances for doubtful accounts. The Company's accounts receivable relate principally to a limited number of customers. As of 
March 31, 2021
, Naval Surface Warfare Center accounted for approximately
28%,
and RWE Renewables, LLC accounted for approximately
11%
of the Company's accounts receivable balance, with
no
other customers accounting for greater than
10%
of the balance. As of
March 31, 2020
, Fuji Bridex Pte. Ltd. accounted for approximately
25%,
Department of Homeland Security accounted for
18%,
and Doosan Heavy Industries & Construction Co., Ltd. accounted for approximately
17%
of the Company's accounts receivable balance, with
no
other customers accounting for greater than
10%
of the balance. Changes in the financial condition or operations of the Company's customers
may
result in delayed payments or non-payments which would adversely impact its cash flows from operating activities and/or its results of operations. As such, the Company
may
require collateral, advanced payment or other security based upon the customer history and/or creditworthiness. In determining the allowance for doubtful accounts, the Company evaluates the collectability of accounts receivable based primarily on the probability of recoverability based on historical collection and write-off experience, the age of past due receivables, specific customer circumstances, and current economic trends. If the financial condition of the Company's customers were to deteriorate, resulting in an impairment of their ability to make payment, additional allowances
may
be required. Failure to accurately estimate the losses for doubtful accounts and ensure that payments are received on a timely basis could have a material adverse effect on the Company's business, financial condition, results of operations, and cash flows.
Inventory, Policy [Policy Text Block]
Inventory
 
Inventories include material, direct labor and related manufacturing overhead, and are stated at the lower of cost, determined on a
first
-in,
first
-out basis, or net realizable value determined as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The Company records inventory when it takes delivery and title to the product according to the terms of each supply contract.
 
Program costs
may
be deferred and recorded as inventory on contracts on which costs are incurred in excess of approved contractual amounts and/or funding, if future recovery of the costs is deemed probable.
 
At each balance sheet date, the Company evaluates its ending inventories for excess quantities and obsolescence. Inventories that management considers excess or obsolete are reserved. Management considers forecasted demand in relation to the inventory on hand, competitiveness of product offerings, market conditions and product life cycles when determining excess and obsolescence and net realizable value adjustments. Once inventory is written down and a new cost basis is established, it is
not
written back up if demand increases.
 
For the fiscal years ended 
March 31, 2021
and
2020
, the Company recorded inventory reserves of approximately $
1.8
 million and
$1.3
 million, respectively, based on evaluating its ending inventory on hand for excess quantities and obsolescence.
Lessee, Leases [Policy Text Block]
Leases
 
Leases include all agreements in which the Company obtains control of a physical asset.  Leases are captured on the balance sheet as both a right of use asset and associated lease liability and are valued based on the commencement of the Company's control of the asset, after being discounted by its incremental borrowing rate.  The Company's lease portfolio is made up primarily of real estate leases for its various offices, but also include items such as vehicles, IT equipment and other miscellaneous tools and equipment needed for manufacturing.  The Company's incremental borrowing rate was determined through an analysis to identify what rates it could obtain if the Company were to secure external financing for similar transactions, and includes considerations of both the market and its current credit ratings.  An analysis is performed annually, or upon execution of any individually material agreement, to ensure that the rates being applied to newly acquired leases are still accurate.
 
The majority of the Company's leases are classified as operating leases, and therefore the expense is captured in income from operations each period.
 
We have elected to exclude all leases of less than
twelve
months from the balance sheet presentation.  We have also elected a policy in which we will
not
segregate lease components from non-lease components, so in the event we execute an agreement which includes a non-lease component our asset and liability recorded to the balance sheet will include the value of that non-lease component as well.  This policy will be applied to all classifications of leases.
Property, Plant and Equipment, Policy [Policy Text Block]
Property, Plant and Equipment
 
Property, plant and equipment are carried at cost less accumulated depreciation and amortization. The Company accounts for depreciation and amortization using the straight-line method to allocate the cost of property, plant and equipment over their estimated useful lives as follows:
 
Asset Classification
 
Estimated Useful Life in Years
 
Machinery and equipment
 
3
-
10
 
Furniture and fixtures
 
3
-
5
 
Leasehold improvements
 
Shorter of the estimated useful life or the remaining lease term
 
 
Expenditures for maintenance and repairs are expensed as incurred. Upon retirement or other disposition of assets, the costs and related accumulated depreciation are eliminated from the accounts and the resulting gain or loss is reflected in operating expenses.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Valuation of Long-Lived Assets
 
The Company periodically evaluates its long-lived assets, consisting principally of fixed assets and amortizable intangible assets, for potential impairment. In accordance with the applicable accounting guidance for the treatment of long-lived assets, the Company reviews the carrying value of its long-lived assets or asset group that is held and used, including intangible assets subject to amortization, for impairment whenever events and circumstances indicate that the carrying value of the assets
may
not
be recoverable. Under the held and used approach, the asset or asset group to be tested for impairment should represent the lowest level for which identifiable cash flows are largely independent of the cash flows of other groups of assets and liabilities. The Company evaluates its long-lived assets whenever events or circumstances suggest that the carrying amount of an asset or group of assets
may
not
be recoverable from the estimated undiscounted future cash flows.
 
There were
no
indicators requiring impairment testing on the Company's long-lived assets during the fiscal years ended 
March 31, 2021
and
2020
.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
Goodwill
 
Goodwill represents the excess of cost over net assets of acquired businesses that are consolidated. The Company performs its annual assessment of goodwill on
February
28th
of each fiscal year and whenever events or changes in circumstances or a triggering event indicate that the carrying amount
may
not
be recoverable. Determining whether a triggering event has occurred often involves significant judgment from management. An entity is permitted to
first
assess qualitatively whether it is necessary to perform a goodwill impairment test. The quantitative impairment test is required only if the entity concludes that it is more likely than
not
that a reporting unit's fair value is less than its carrying amount. The Company determines the fair value of a reporting unit based on an income approach utilizing a discounted cash flow adjusted for entity specific factors. In evaluating whether it is more likely than
not
that the fair value of a reporting unit is less than its carrying amount, an entity should consider the totality of all relevant events or circumstances that affect the fair value or carrying amount of a reporting unit.  If the carrying value of a reporting unit exceeds the reporting unit's fair value, then an impairment charge is recognized reducing the goodwill by the excess of the carrying amount over the fair value,
not
to exceed the total amount of the goodwill allocated to the that reporting unit. See Note
5,
"Goodwill" for further information and discussion.
 
The Company performed its annual assessment of goodwill on
February 28, 2021
and noted
no
triggering events from the analysis date to 
March 31, 2021
and determined that there was
no
impairment to goodwill.  Additionally, there was
no
impairment identified for the fiscal year ended 
March 31, 2020
based on the assessment performed in the prior fiscal year.
Revenue [Policy Text Block]
Revenue Recognition
 
Revenue contracts are defined as an arrangement that creates enforceable rights and obligations of both parties where collection of the contract price is deemed probable.
The Company records revenue based on a
five
-step model which includes confirmation of contract existence, identifying the performance obligations, determining the transaction price, allocating the contract transaction price to the performance obligations, and recognizing the revenue when (or as) control of goods or services is transferred to the customer. The transfer of control
can occur at the time of delivery, installation or post-installation where applicable. 
 
The Company's equipment and system product line includes certain contracts which do
not
meet the requirements of an exchange transaction and therefore do
not
fall within the scope of ASC
606.
  As these non-exchange transaction contracts are considered grant revenue and do
not
fall within any specific accounting literature, the Company follows guidance within ASC
606
by analogy to recognize grant revenue over time. 
 
For certain arrangements, such as contracts to perform research and development, prototype development contracts and certain customized product sales, the Company records revenues using the over-time method, measured by the relationship of costs incurred to total estimated contract costs. Over-time revenue recognition accounting is predominantly used on certain turnkey power systems installations for electric utilities and long-term prototype development contracts with the U.S. government. The Company follows this method when any of the
three
following criteria are met: when the customer receives the benefits as they are performed, control transfers to the customer as the work is performed, or there is
no
alternative use to the Company and there is an enforceable right to payment through the life of the contract. However, the ability to reliably estimate total costs at completion is challenging, especially on long-term prototype development contracts, and could result in future changes in contract estimates. For contracts where reasonably dependable estimates of the revenues and costs cannot be made, the Company follows the point in time method.
 
The Company enters into sales arrangements that
may
provide for multiple performance obligations to a customer. Sales of certain products
may
include extended warranty and support or service packages, and at times include performance bonds. As these contracts progress, the Company continually assesses the probability of a payout from the performance bond. Should the Company determine that such a payout is likely, the Company would record a liability. The Company would reduce revenue to the extent a liability is recorded. In addition, the Company enters into licensing arrangements that include training services.
 
Performance obligations are separated into more than
one
unit of accounting when (
1
) the delivered element(s) have value to the customer on a stand-alone basis, and (
2
) the Company's promise to transfer the goods or services to the customer is separately identifiable from other promises in the contract.  In general, revenues are separated between the different product shipments which have stand-alone value, and the various services to be provided. Revenue for product shipments is generally recognized at a point in time where control of the product is transferred to the customer, while revenues for the services are generally recognized over the period of performance. The Company identifies all goods and/or services that are to be delivered separately under a sales arrangement and
allocates the transaction price to each distinct performance obligation using the respective standalone selling price ("SSP") which is determined primarily using the cost plus expected margin approach for products and a relief from royalty method for licenses.  Revenue allocated to each performance obligation is recognized when, or as, the performance obligation is satisfied. 
The Company reviews SSP and the related margins at least annually.
 
The Company's license agreements provide either for the payment of contractually determined paid-up front license fees or milestone based payments in consideration for the grant of rights to manufacture and/or sell products using its patented technologies or know-how. Some of these agreements provide for the release of the licensee from past and future intellectual property infringement claims. When the Company can determine that it has
no
further obligations other than the grant of the license and that the Company has fully transferred the technology know-how, the Company recognizes the revenue under a point in time model. In other license arrangements, the Company
may
also agree to provide training services to transfer the technology know-how.  In these arrangements, the Company has determined that the licenses have
no
standalone value to the customer and are
not
separable from training services as the Company can only fully transfer the technology know-how through the training component. Accordingly, the Company accounts for these arrangements as a single unit of accounting, and recognizes revenue over the period of its performance using the over-time method. Costs for these arrangements are expensed as incurred.
 
Existing customers are subject to ongoing credit evaluations based on payment history and other factors. If it is determined that collectability of any portion of the contract value is
not
probable, an analysis of variable consideration will be performed using either the most likely amount or expected value method to determine the amount of revenue that must be constrained until the scenario causing the variability has been resolved. For contractual arrangements that involve variable consideration, the Company recognizes revenue for these amounts upon reaching the constraining event successfully.  The Company does
not
generally provide for extended payment terms or provide its customers with a right of return.
 
The Company has elected to record taxes collected from customers on a net basis and does
not
include tax amounts in revenue or costs of revenue.
 
The Company's contract assets and liabilities primarily relate to the timing differences between cash received from a customer in connection with contractual rights to invoicing and the timing of revenue recognition following completion of performance obligations. The Company's accounts receivable balance is made up entirely of customer contract related balances. 
 
See Note
4,
“Revenue Recognition,” for further information regarding the Company's adoption of Accounting Standards Codification (“ASC”)
606,
 
Revenue from Contracts with Customers
.
Business Combinations Policy [Policy Text Block]
Business Acquisitions
 
The Company accounts for acquisitions using the purchase method of accounting in accordance with ASC
805,
Business Combinations
. The purchase price for each acquisition is allocated to the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. Intangible assets, if identified, are also recorded at fair value.  The excess purchase price over the estimated fair value of the net assets acquired is recorded as goodwill.
 
Determining the fair value of certain assets and liabilities assumed is judgmental in nature and often involves the use of significant estimates and assumptions as well as the use of specialists as needed.
 
The consideration for its acquisitions
may
include future payments that are contingent upon the occurrence of a particular event. The Company records a contingent consideration obligation for such contingent consideration payments at fair value on the acquisition date. The Company estimates the fair value of contingent consideration obligations through valuation models that incorporate probability adjusted assumptions related to the achievement of the milestones and the likelihood of making related payments. Each period the Company revalues the contingent consideration obligations associated with the acquisition to fair value and records changes in the fair value within the operating expenses in its consolidated statements of operations. Increases or decreases in the fair value of the contingent consideration obligations can result from changes in assumed revenue risk premium and volatility, as well as changes in the stock price and assumed probability with respect to the attainment of certain financial and operational metrics, among others. Significant judgment is employed in determining these assumptions as of the acquisition date and for each subsequent period. Accordingly, future business and economic conditions, as well as changes in any of the assumptions described above, can materially impact the fair value of contingent consideration recorded at each reporting period. See Note
3,
"NEPSI Acquisition," for additional information.
Standard Product Warranty, Policy [Policy Text Block]
Product Warranty
 
Warranty obligations are incurred in connection with the sale of the Company's products.  The Company provides assurance-type warranties on all product sales for a term of typically 
one
 to 
three
years, and extended service-type warranties at the customers' option for an additional term ranging up to 
four
 additional years. The Company accrues for the estimated warranty costs for assurance warranties at the time of sale based on historical warranty experience plus any known or expected changes in warranty exposure. For all extended service-type warranties, the Company recognizes the revenue ratably over time during the effective period of the service.  The costs incurred to provide for these warranty obligations are estimated and recorded as an accrued liability at the time of sale. Future warranty costs are estimated based on historical performance rates and related costs to repair given products. The accounting estimate related to product warranty involves judgment in determining future estimated warranty costs. Should actual performance rates or repair costs differ from estimates, revision to the estimated warranty liability would be required.
Research and Development Expense, Policy [Policy Text Block]
Research and Development Costs
 
Research and development costs are expensed as incurred.
Income Tax, Policy [Policy Text Block]
Income Taxes
 
The Company's provision for income taxes is comprised of a current and a deferred portion. The current income tax provision is calculated as the estimated taxes payable or refundable on tax returns for the current fiscal year. The deferred income tax provision is calculated for the estimated future tax effects attributable to temporary differences and carry-forwards using expected tax rates in effect in the years during which the differences are expected to reverse.
 
Deferred income taxes are recognized for the tax consequences in future fiscal years of differences between the tax bases of assets and liabilities and their financial reporting amounts at each fiscal year end based on enacted tax laws and statutory tax rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce net deferred tax assets to the amount expected to be realized. The Company has provided a valuation allowance against its U.S., Romania and China deferred income tax assets since the Company believes that it is more likely than
not
that these deferred tax assets are
not
currently realizable due to uncertainty around profitability in the future.
 
Accounting for income taxes requires a
two
-step approach to recognizing and measuring uncertain tax positions. The
first
step is to evaluate the tax position for recognition by determining if, based on the technical merits, it is more likely than
not
that the position will be sustained upon audit, including resolution of related appeals or litigation processes, if any. The
second
step is to measure the tax benefit as the largest amount that is more than
50%
likely of being realized upon ultimate settlement. The Company reevaluates these uncertain tax positions on a quarterly basis. This evaluation is based on factors including, but
not
limited to, changes in facts or circumstances, changes in tax law, effectively settled issues under audit and new audit activity. Any changes in these factors could result in the recognition of a tax benefit or an additional charge to the tax provision. The Company includes interest and penalties related to gross unrecognized tax benefits within the provision for income taxes.  See Note
13,
“Income Taxes,” for further information regarding its income tax assumptions and expenses.
Share-based Payment Arrangement [Policy Text Block]
Stock-Based Compensation
 
The Company accounts for stock-based payment transactions using a fair value-based method and recognizes the related expense in the results of operations.
 
Stock-based compensation is estimated at the grant date based on the fair value of the award and is recognized as expense over the requisite service period of the award. The fair value of restricted stock awards is determined by reference to the fair market value of the Company's common stock on the date of grant. The Company uses the Black-Scholes option pricing model to estimate the fair value of awards with service and performance conditions. For awards with service conditions only, the Company recognizes compensation cost on a straight-line basis over the requisite service/vesting period. For awards with performance conditions, estimates of compensation cost are made based on the probable outcome of the performance conditions. The cumulative effect of changes in the probability outcomes are recorded in the period in which the changes occur.
 
Determining the appropriate fair value model and related assumptions requires judgment, including estimating stock price volatilities of the Company's common stock and expected terms. The expected volatility rates are estimated based on historical and implied volatilities of the Company's common stock. The expected term represents the average time that the options that vest are expected to be outstanding based on the vesting provisions and the Company's historical exercise, cancellation and expiration patterns.
 
The Company estimates pre-vesting forfeitures when recognizing compensation expense based on historical and forward-looking factors. Changes in estimated forfeiture rates and differences between estimated forfeiture rates and actual experience
may
result in significant, unanticipated increases or decreases in stock-based compensation expense from period to period. The termination of employment of certain employees who hold large numbers of stock-based awards
may
also have a significant, unanticipated impact on forfeiture experience and, therefore, on stock-based compensation expense. The Company will update these assumptions on at least an annual basis and on an interim basis if significant changes to the assumptions are warranted.
 
The Company accounts 
for share-based payments made to non-employees 
in the same manner as other share-based payments for employees, with the measurement being based on the fair value at the grant date.   The non-employee share based payments will be included within the Company's stock compensation currently reported.
Earnings Per Share, Policy [Policy Text Block]
Computation of Net Loss per Common Share
 
Basic net loss per share (“EPS”) is computed by dividing net loss by the weighted-average number of common shares outstanding for the period. Diluted EPS is computed by dividing the net loss by the weighted-average number of common shares and dilutive common equivalent shares outstanding during the period, calculated using the treasury stock method. Common equivalent shares include the effect of restricted stock, exercise of stock options and warrants and contingently issuable shares. For the fiscal years ended 
March 31, 2021
and
2020
, common equivalent shares of
436,139,
and
354,748,
respectively, were
not
included in the calculation of diluted EPS as they were considered antidilutive. The following table
reconciles
the numerators and denominators of the EPS calculation for the fiscal years ended 
March 31, 2021
and 
2020
(in thousands except per share amounts):
 
   
Fiscal year ended March 31,
 
   
2021
   
2020
 
Numerator:
               
Net loss
  $
(22,678
)   $
(17,096
)
Less: decrease in fair value of warrants, net of income tax    
     
(4,648
)
Plus: change in fair value due to exercise of warrants    
     
83
 
Net loss - diluted   $
(22,678
)   $
(21,662
)
Denominator:
               
Weighted-average shares of common stock outstanding    
24,991
     
21,937
 
Weighted-average shares subject to repurchase
   
(1,112
)    
(953
)
Shares used in per-share calculation ― basic
   
23,879
     
20,985
 
Common stock warrants    
     
84
 
Shares used in per-share calculation ― diluted
   
23,879
     
21,069
 
Net loss per share ― basic
  $
(0.95
)   $
(0.81
)
Net loss per share ― diluted
  $
(0.95
)   $
(1.03
)
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Foreign Currency Translation
 
The functional currency of all the Company's foreign subsidiaries is the U.S. dollar, except for AMSC Austria, for which the local currency (Euro) is the functional currency, and AMSC China, for which the local currency (Renminbi) is the functional currency. The assets and liabilities of AMSC Austria and AMSC China are translated into U.S. dollars at the exchange rate in effect at the balance sheet date and income and expense items are translated at average rates for the period. Cumulative translation adjustments are excluded from net loss and shown as a separate component of stockholders' equity. Net foreign currency gains and losses are included in other income (expense), net on the consolidated statements of operations and were
$0.7
million and
$0.1
 million, for the fiscal years ended 
March 31, 2021
and
2020
, respectively. The Company has
no
restrictions on the foreign exchange activities of its foreign subsidiaries, including the payment of dividends and other distributions.
Risks and Uncertainties [Policy Text Block]
Risks and Uncertainties
 
The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could materially differ from those estimates and would impact future results of operations and cash flows.
 
The Company invests its available cash in high credit, quality financial instruments and invests primarily in investment-grade marketable securities, including, but
not
limited to, government obligations, money market funds and corporate debt instruments.
 
Several of the Company's government contracts are being funded incrementally, and as such, are subject to the future authorization, appropriation, and availability of government funding. The Company has a history of successfully obtaining financing under incrementally-funded contracts with the U.S. government and it expects to continue to obtain additional contract modifications in the year ending
March 
31,
2022
 and beyond as incremental funding is authorized and appropriated by the government.
Commitments and Contingencies, Policy [Policy Text Block]
Contingencies
 
From time to time, the Company
may
be involved in legal and administrative proceedings and claims of various types. The Company records a liability in its consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. Management reviews these estimates in each accounting period as additional information is known and adjusts the loss provision when appropriate. If the loss is
not
probable or cannot be reasonably estimated, a liability is
not
recorded in the consolidated financial statements. If, with respect to a matter, it is
not
both probable to result in liability and the amount of loss cannot be reasonably estimated, an estimate of possible loss or range of loss is disclosed unless such an estimate cannot be made. The Company does
not
recognize gain contingencies until they are realized. Legal costs incurred in connection with loss contingencies are expensed as incurred. See Note
16,
“Commitments and Contingencies,” for further information.
Fair Value of Financial Instruments, Policy [Policy Text Block]
Disclosure of Fair Value of Financial Instruments
 
The Company's financial instruments consist principally of cash and cash equivalents, accounts receivable, marketable securities, accounts payable, accrued expenses, warrants to purchase shares of common stock, and derivatives. The carrying amounts of cash and cash equivalents, accounts receivable, short-term debt, accounts payable, and accrued expenses due to their short nature approximate fair value at 
March 31, 2021
and
2020
. The estimated fair values have been determined through information obtained from market sources and management estimates.  Marketable securities consist of certificates of deposit with maturities of less than
12
months that are measured using such inputs as quoted prices and are classified within Level
1
of the valuation hierarchy. The Company determines the appropriate classification of its marketable securities at the time of purchase and re-evaluates such classification as of each balance sheet date.  All marketable securities are considered available for sale and are carried at fair value.   Changes in fair value are recorded to other income (expense), net. The fair value for the contingent consideration is estimated using a Monte Carlo simulation and subject to revaluation at each balance sheet date.  The fair value for the warrant arrangements was historically estimated by management based on various assumptions in a lattice model and was subject to revaluation at each balance sheet date.  The Company classifies the estimates used to fair value these instruments as Level
3
inputs. See Note
6,
“Fair Value Measurements” for a full discussion on fair value measurements.