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Summary of Stock Option, Restricted Stock Award, and Restricted Stock Unit Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Options and restricted stock available for grant, Beginning Balance 14,563,000  
Options and restricted stock available for grant, increase to pool 2,056,000  
Options granted (1,008,000)  
Options exercised 163,000  
Options expired 439,000  
Options forfeited 265,000  
Options and restricted stock available for grant, Ending Balance 16,116,000 14,563,000
Options exercisable at December 31, 2021 1,888,000  
Number of shares, Beginning Balance 3,460,000  
Options granted, Shares 1,008,000  
Options exercised, Shares (163,000)  
Options expired, Shares (439,000)  
Options forfeited, Shares (265,000)  
Number of shares, Ending Balance 3,601,000 3,460,000
Weighted average exercise price, Beginning Balance $ 3.82  
Options granted, Weighted average exercise price 2.61  
Options exercised, Weighted average exercise price 2.73  
Options expired, Weighted average exercise price 5.16  
Options forfeited, Weighted average exercise price 3.01  
Weighted average exercise price, Ending Balance 3.43 $ 3.82
Options exercisable at December 31, 2021 $ 4.10  
Weighted average remaining contractual term 6 years 5 months 15 days 6 years 6 months
Weighted average remaining contractual term, Options exercisable at December 31, 2019 4 years 8 months 1 day  
Aggregate intrinsic value, Outstanding $ 360 $ 27
Aggregate intrinsic value, Options exercisable at December 31, 2021 $ 54  
Restricted Stock    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Restricted stock granted (615,000)  
Restricted stock forfeited 253,000