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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Income Tax Disclosure [Line Items]          
Deferred tax assets, valuation allowance $ 51,842   $ 51,842   $ 47,809
Effective tax rate     0.00% 0.00%  
Change in valuation allowance     $ 4,033    
ASU No. 2016-09 [Member]          
Income Tax Disclosure [Line Items]          
Excess tax benefits recognized in the provision for income taxes offset by valuation allowance $ 1,003 $ 2,236 $ 748 $ 2,044