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Stock-Based Compensation - Summary of Outstanding Stock Options and Related Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Outstanding Shares, beginning balance 197 158  
Granted Shares 22 65  
Exercised Shares (13) (13)  
Canceled / expired Shares (1) (13)  
Outstanding Shares, ending balance 205 197  
Exercisable Shares 135 112 121
Vested and expected to vest Shares 181    
Outstanding Weighted Avg. Exercise Price, beginning balance $ 4.03 $ 4.88  
Granted, Weighted Avg. Exercise Price 4.25 2.65  
Exercised, Weighted Avg. Exercise Price 2.14 3.81  
Canceled / expired, Weighted Avg. Exercise Price 42.04 7.81  
Outstanding Weighted Avg. Exercise Price, ending balance 3.95 4.03  
Exercisable, Weighted Avg. Exercise Price 4.35 $ 5.16 $ 5.64
Vested and expected to vest, Weighted Avg. Exercise Price $ 3.77    
Outstanding Wtd. Avg. Remaining Contractual Life 5 years 7 months 6 days 6 years 3 months 18 days  
Exercisable, Wtd. Avg. Remaining Contractual Life 4 years 1 month 6 days    
Vested and expected to vest, Wtd. Avg. Remaining Contractual Life 5 years 6 months    
Aggregate Intrinsic Value, beginning balance $ 171    
Aggregate Intrinsic Value, Exercised 39 $ 28  
Aggregate Intrinsic Value, Canceled / Expired   22  
Aggregate Intrinsic Value, ending balance 341 $ 171  
Exercisable, Aggregate Intrinsic Value 183    
Vested and expected to vest, Aggregate Intrinsic Value $ 304