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Income Taxes - Difference between Benefit from Income Taxes and Amount Computed by Applying Statutory Income Tax Rate to Income Before Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Benefits from taxes at statutory rate | $ (5,620) | $ (29,087) | $ (13,698)
Rate differential | 3,009 | 9,796 | 3,071
Change in valuation reserves | (2,141) | 8,728 | 22,115
Derivative liabilities |  | 337 |
Nondeductible employee compensation | 5,472 | 3,058 | 1,668
Stock option/RSU windfall | (14,342) | (7,684) | (1,182)
ISO Disqualifying Disposition Windfall | (2,849) |  |
Research and development credits | (1,607) | (1,438) | (1,177)
Tax return to provision adjustments | (3,222) | 6,736 | 5,788
U.S. rate change—tax reform |  |  | 7,398
Cumulative translation adjustment | 2,025 | 5,711 | (12,554)
Permanent and other | (443) | (404) | 1,635
Non-deductible interest expense |  | 267 | (17)
Tax reserves | 18,799 | 4,956 |
Corscianto Liquidation | 1,727 |  |
Long-term debt from royalty-bearing instrument | (644) | (880) |
Provision for income taxes | $ 164 | $ 96 | $ 13,047

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