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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
Dec. 31, 2018
Income Tax Disclosure [Line Items]            
Income tax benefit, result of CARES act of 2020     $ 10,800,000      
Valuation allowance established against deferred tax assets     7,900,000      
Tax rate differential on carrying back losses amount     $ 2,900,000      
US corporate tax rate     35.00%      
Federal tax rate   21.00% 21.00% 21.00%    
Income tax expense, result of Alabama business tax competitiveness act $ 1,600,000          
Deferred tax asset, research and development credit carryforwards   $ 21,606,000 $ 17,323,000      
Deferred tax expense (benefit) recorded as an adjustment to other comprehensive (loss) income   1,600,000 (100,000)      
Deferred tax assets, gross   59,643,000 55,687,000      
Valuation allowance established against deferred tax assets   50,564,000 45,818,000      
Deferred tax assets tax credit carryforward net operating loss and research and development   2,300,000        
Increase in valuation allowance   4,700,000        
Net of deferred tax liabilities   9,079,000 9,869,000      
Foreign and domestic loss carry-forwards, research and development tax credits, unamortized research and development cost and state credit carry-forwards   $ 39,700,000 37,300,000      
Operating loss carry forwards expiration year   2029        
Deferred tax assets   $ 18,708,000 21,625,000      
Cash and cash equivalents   56,603,000 60,161,000      
Short-term investments (includes $350 and $1,731 of available-for-sale securities as of December 31, 2021 and 2020, respectively, reported at fair value)   350,000 3,131,000      
Short-term liquidity amount   57,000,000.0 63,300,000      
Withholding tax liabilities in jurisdiction   700,000 700,000      
Income tax benefit (expense) from stock options exercised adjustment to equity   0 0 $ 0    
Unrecognized tax benefits   17,836,000 1,078,000 1,487,000   $ 1,868,000
Unrecognized tax benefits, effective tax rate   17,800,000 1,000,000.0 1,400,000    
Accrued interest and penalties   200,000 300,000 $ 500,000    
Foreign Subsidiaries [Member]            
Income Tax Disclosure [Line Items]            
Short-term liquidity amount   $ 47,700,000 $ 49,700,000      
Short-term liquidity, in percentage   83.50% 78.50%      
Operating Losses Expiration Between 2021 and 2040 [Member]            
Income Tax Disclosure [Line Items]            
Deferred tax assets   $ 27,300,000        
Minimum [Member]            
Income Tax Disclosure [Line Items]            
Operating loss carry forwards expiration year   2022        
Maximum [Member]            
Income Tax Disclosure [Line Items]            
Operating loss carry forwards expiration year   2041        
IRS [Member]            
Income Tax Disclosure [Line Items]            
Income tax refund receivable         $ 15,200,000  
Deferred tax asset, research and development credit carryforwards         1,800,000  
Unrecognized tax benefits         $ 17,000,000.0  
Domestic [Member]            
Income Tax Disclosure [Line Items]            
Deferred tax assets, gross   $ 48,265,000 $ 43,791,000      
Valuation allowance established against deferred tax assets   48,265,000 $ 43,791,000      
Current valuation allowance established against deferred tax assets   $ 48,300,000