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Income Taxes - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Apr. 01, 2017
Income Tax Contingency [Line Items] |  |  |  |  |
U.S. statutory federal income tax rate, percent | 35.00% |  | 21.00% | 31.60% |
Cumulative effect adjustment related to unrecognized excess tax benefits on share based compensation |  |  |  |  | $ 58,700,000
Valuation allowance |  | $ 42,621,000 | $ 33,499,000 |  |
Impact on effective tax rate |  | 72,600,000 |  |  |
Accrued interest or penalties associated with uncertain tax positions |  | 0 | $ 0 |  |
Income tax expense |  |  |  | $ 5,300,000 |
United States [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards |  | $ 831,900,000 |  |  |
Operating loss carryforwards expiration beginning year |  | 2021 |  |  |
Tax years subject to examination |  | 2017 and thereafter |  |  |
United States [Member] | Research & Development [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credit carryforward amount |  | $ 189,900,000 |  |  |
United States [Member] | Research & Development [Member] | Earliest Tax Year [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credit carryforwards expiration beginning year |  | 2026 |  |  |
State [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards |  | $ 603,900,000 |  |  |
Operating loss carryforwards expiration beginning year |  | 2021 |  |  |
Tax years subject to examination |  | 2017 and thereafter |  |  |
State [Member] | Research & Development [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credit carryforward amount |  | $ 162,600,000 |  |  |
State [Member] | Research & Development [Member] | Earliest Tax Year [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credit carryforwards expiration beginning year |  | 2021 |  |  |
Foreign [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credit carryforward amount |  | $ 1,900,000 |  |  |
Tax years subject to examination |  | 2016 and thereafter |  |  |
Foreign [Member] | Earliest Tax Year [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credit carryforwards expiration beginning year |  | 2021 |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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