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Fair Value Measurements | 6 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements A valuation hierarchy for disclosure of the inputs to valuation used to measure fair value has been established. This hierarchy prioritizes the inputs into three broad levels as follows:
| Level 1 | - | Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
| Level 2 | - | Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs).
| Level 3 | - | Unobservable inputs that reflect the Company’s assumptions that market participants would use in pricing the asset or liability. The Company develops these inputs based on the best information available, including its own data.
The Company provides a gross presentation of activity within Level 3 measurement roll-forward and details of transfers in and out of Level 1 and 2 measurements. A change in the hierarchy of an investment from its current level is reflected in the period during which the pricing methodology of such investment changes. Disclosure of the transfer of securities from Level 1 to Level 2 or Level 3 is made in the event that the related security is significant to total cash and investments. The Company did not have any transfers of assets and liabilities from Level 1, Level 2 or Level 3 of the fair value measurement hierarchy during the six months ended September 30, 2018. A financial asset’s or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The following table provides the assets and liabilities carried at fair value on a recurring basis, measured as of September 30, 2018 and March 31, 2018 (in thousands):
| Total Carrying Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
September 30, 2018: |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Cash equivalents | $ | 46,841 |  |  | $ | 46,841 |  |  | $ | — |  |  | $ | — |
Derivative liabilities: |  |  |  |  |  |  |
Warrants | 1,399 |  |  | — |  |  | — |  |  | 1,399 |
| Total Carrying Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
March 31, 2018: |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Cash equivalents | $ | 32,589 |  |  | $ | 32,589 |  |  | $ | — |  |  | $ | — |
Derivative liabilities: |  |  |  |  |  |  |
Warrants | $ | 1,217 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,217 |
The table below reflects the activity for the Company’s major classes of liabilities measured at fair value on a recurring basis (in thousands):
| Warrants
April 1, 2018 | $ | 1,217 |
Mark to market adjustment | 182 |
Balance at September 30, 2018 | $ | 1,399 |
| Warrants |  | Acquisition Contingent Consideration
April 1, 2017 | $ | 1,923 |  |  | $ | — |
Issuance of contingent consideration | — |  |  | 571 |
Mark to market adjustment | (1,069 | ) |  | (201 | )
Balance at September 30, 2017 | $ | 854 |  |  | $ | 370 |
Valuation Techniques 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. Warrants Warrants were issued in conjunction with a Securities Purchase Agreement (the “Purchase Agreement”) with Capital Ventures International (“CVI”), an equity offering to Hudson Bay Capital in November 2014, and a Loan and Security Agreement with Hercules Technology Growth Capital, Inc. (“Hercules”). These warrants issued to CVI expired on October 4, 2017. See Note 13 “Warrants and Derivative Liabilities,” for additional information. Outstanding warrants are subject to revaluation at each balance sheet date, and any change in fair value will be recorded as a change in fair value in derivatives and warrants until the earlier of their exercise or expiration. The Company relies on various assumptions in a lattice model to determine the fair value of warrants. The Company has valued the warrants within Level 3 of the valuation hierarchy. See Note 13, “Warrants and Derivative Liabilities,” for a discussion of the warrants and the valuation assumptions used. Contingent Consideration Contingent consideration relates to a make whole payment provision set forth in the stock purchase agreement ("SPA") for the acquisition of ITC that requires the Company to guarantee the purchase price of the acquisition should the aggregate proceeds of the resale of AMSC shares sold by selling stockholders during the first 90 days after the effectiveness of the resale registration statement be less than the agreed upon purchase price for such AMSC shares (per the terms of the SPA) sold during such 90 day period. See Note 13, "Warrants and Derivative Liabilities" and Note 5, “Acquisition and Related Goodwill” for further discussion. The Company relied on a Black Scholes option pricing method to determine the fair value of the contingent consideration on the date of acquisition. All of the stock related to this liability was sold as of December 5, 2017 and the amount of the make whole payment provided for in the SPA was calculated to be $0.7 million, and subsequently paid on January 5, 2018.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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