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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance | $ 82,938 | $ 85,743 |  |
Increase (decrease) in valuation allowance | (2,800) | 7,100 |  |
Undistributed earnings of foreign subsidiaries | 16,000 | 13,600 |  |
Unrecognized tax benefits | 4,585 | 4,441 | $ 4,191 | $ 3,782
Unrecognized tax benefits that would affect the effective tax rate | 800 |  |  |
U.S. Federal |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 177,000 | 193,800 |  |
State |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 78,000 | 84,600 |  |
Research and Development Credit Carryforward | U.S. Federal |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward | 16,400 | 15,300 |  |
Research and Development Credit Carryforward | State |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward | $ 18,200 | $ 16,400 |  |

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