General form of registration statement for all companies including face-amount certificate companies

Income Taxes - Additional Information (Detail)

v3.21.2
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 30, 2020
Income Tax Disclosure [Line Items]        
U.S. federal tax benefit at statutory rate 21.00% 21.00%    
Accumulated undistributed Foreign subsidiaries earnings $ 6,128      
Valuation allowance $ 43,330 $ 36,806 $ 28,821  
Increase in valuation allowance   6,524 $ 7,985  
Internal Revenue Service (IRS) [Member]        
Income Tax Disclosure [Line Items]        
Change in Ownership occur if there is a cumulative change in ownership percentage of shareholders 5-percent shareholders      
Change in Ownership occur when percentage of shareholders exceeds threshold points over three year rolling period 50.00%      
Domestic Tax Authority [Member]        
Income Tax Disclosure [Line Items]        
Operating losses available to reduce future taxable income   110,514   $ 135,134
Operating loss carried forward indefinitely $ 52,609      
Operating loss carried forward Subject to expiration $ 82,525      
State and Local Jurisdiction [Member]        
Income Tax Disclosure [Line Items]        
Operating losses available to reduce future taxable income   13,179   $ 26,783
Operating loss carryforward will begin to expire period 2032      
Tax Period Two Thousand And Thirty Nine [Member] | Research Tax Credit Carryforward [Member]        
Income Tax Disclosure [Line Items]        
Federal research and development tax credit carryforward amount $ 2,454 735    
Tax Period Two Thousand Thirty Five [Member] | Luxembourg Tax Authority [Member]        
Income Tax Disclosure [Line Items]        
Operating losses available to reduce future taxable income 6,227 4,856    
Indefinite Tax Period [Member] | Singapore Tax Authority [Member]        
Income Tax Disclosure [Line Items]        
Operating losses available to reduce future taxable income $ 2,233 $ 2,336    
Minimum [Member] | Domestic Tax Authority [Member]        
Income Tax Disclosure [Line Items]        
Operating loss carryforward will begin to expire period 2032      
Maximum [Member] | Domestic Tax Authority [Member]        
Income Tax Disclosure [Line Items]        
Operating loss carryforward will begin to expire period 2037