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Income Taxes - Schedule of Reconciliation of Federal Statutory Rate on Loss before Income Taxes and before Gain from Sale of Equity Method Investment Rate to Effective Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Statutory federal tax rate | 21.00% | 21.00% | (34.00%)
State income taxes, net of federal income tax benefit | (8.10%) | 3.60% | 97.20%
Increase (decrease) in valuation allowance | 2.20% | (9.10%) | (936.10%)
Permanent items | (3.90%) | (5.90%) | (861.20%)
Tax credits | (15.60%) | (5.50%) | (1222.30%)
Provision vs. tax return differences | 9.00% | (1.70%) |
Foreign rate differential and deferred items | 0.60% | 0.70% | (91.80%)
Change in tax reserves |  | 0.10% | (5.10%)
Rate change due to tax reform |  |  | 3441.10%
Refundable income taxes - AMT credit |  |  | (751.00%)
Other |  | 0.10% | (0.10%)
Effective income tax rate | 5.20% | 3.30% | (363.30%)

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