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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Line Items]      
Effective tax rate expense (benefit)   197.10% 34.90%
Effective tax rate reduction related to transfer pricing study   9.38%  
Deferred tax assets, gross $ 49,405 $ 49,405  
Valuation allowance established against deferred tax assets 42,913 42,913  
Deferred tax assets, state research and development credits 5,800 5,800  
Deferred tax assets 6,492 6,492  
Domestic [Member]      
Income Tax Disclosure [Line Items]      
Valuation allowance established against deferred tax assets 37,100    
Deferred tax assets, gross 40,496 40,496  
Valuation allowance established against deferred tax assets $ 40,496 $ 40,496