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Income Taxes - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | 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 |  | $ 33,499,000 | $ 29,049,000 |
Impact on effective tax rate |  | 61,200,000 |  |
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 |  | $ 761,500,000 |  |
Operating loss carryforwards expiration beginning year |  | 2021 |  |
United States [Member] | Earliest Tax Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax years subject to examination |  | 2016 |  |
United States [Member] | Latest Tax Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax years subject to examination |  | 2018 |  |
United States [Member] | Research [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax credit carryforward amount |  | $ 163,500,000 |  |
United States [Member] | Research [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 |  | $ 585,100,000 |  |
Operating loss carryforwards expiration beginning year |  | 2020 |  |
State [Member] | Earliest Tax Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax years subject to examination |  | 2015 |  |
State [Member] | Latest Tax Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax years subject to examination |  | 2018 |  |
State [Member] | Research [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax credit carryforward amount |  | $ 146,300,000 |  |
State [Member] | Research [Member] | Earliest Tax Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax credit carryforwards expiration beginning year |  | 2020 |  |
Foreign [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax credit carryforward amount |  | $ 1,600,000 |  |
Foreign [Member] | Earliest Tax Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax credit carryforwards expiration beginning year |  | 2021 |  |
Tax years subject to examination |  | 2015 |  |
Foreign [Member] | Latest Tax Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax years subject to examination |  | 2018 |  |

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