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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Net Impact to Stockholders' Equity (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Debt Instrument [Line Items] |  |  |
Total |  | $ 3,094 | $ 31,128
Convertible Debt | Additional Notes |  |  |
Debt Instrument [Line Items] |  |  |
Conversion option |  | 12,810 |
Payments for capped call transactions | $ (9,300) | (9,288) |
Issuance costs |  | (428) |
Total |  | 3,094 |
Convertible Debt | Initial Notes |  |  |
Debt Instrument [Line Items] |  |  |
Conversion option |  | 66,700 |
Payments for capped call transactions | $ (33,700) | (33,724) |
Issuance costs |  | (1,848) |
Total |  | $ 31,128 |

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- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51819886&loc=SL6014347-161799 + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from issuance costs from a share-lending arrangement entered into, in contemplation of a convertible debt offering or other financing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 20A -URI http://asc.fasb.org/extlink&oid=109126253&loc=SL6757427-112606 + Details
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