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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Line Items]              
Effective tax rate expense (benefit) 14.10%   9.30% 354.50% (36.80%)    
Income tax benefit, result of CARES act of 2020         $ 7,800    
Income tax expense, result of Alabama business tax competitiveness act   $ 1,600          
Unrecognized tax benefits $ 18,178     $ 18,178   $ 1,078 $ 1,487
Deferred tax assets, gross 59,189     59,189   55,687  
Valuation allowance established against deferred tax assets 50,232     50,232   45,818  
Deferred tax assets 8,957     8,957   9,869  
Unrecognized tax benefits, effective tax rate 18,100     18,100   1,000  
Accrued interest and penalties 300     300   300  
IRS [Member]              
Income Tax Disclosure [Line Items]              
Income tax refund receivable 15,200     15,200      
Deferred tax asset, research and development credit carryforwards 1,800     1,800      
Unrecognized tax benefits 17,000     17,000      
Domestic [Member]              
Income Tax Disclosure [Line Items]              
Deferred tax assets, gross 47,839     47,839   43,791  
Valuation allowance established against deferred tax assets 47,839     47,839   43,791  
Increase in deferred tax asset valuation allowance       4,000      
International [Member]              
Income Tax Disclosure [Line Items]              
Deferred tax assets, gross 11,350     11,350   11,896  
Valuation allowance established against deferred tax assets 2,393     2,393   2,027  
Deferred tax assets $ 8,957     8,957   $ 9,869  
Increase in deferred tax asset valuation allowance       $ 400