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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Outstanding Shares, beginning balance 158 137  
Granted Shares 65 30  
Exercised Shares (13)    
Canceled / expired Shares (13) (9)  
Outstanding Shares, ending balance 197 158  
Exercisable Shares 112 121 114
Vested and expected to vest Shares 163    
Outstanding Weighted Avg. Exercise Price, beginning balance $ 4.88 $ 5.71  
Granted, Weighted Avg. Exercise Price 2.65 2.32  
Exercised, Weighted Avg. Exercise Price 3.81    
Canceled / expired, Weighted Avg. Exercise Price 7.81 8.96  
Outstanding Weighted Avg. Exercise Price, ending balance 4.03 4.88  
Exercisable, Weighted Avg. Exercise Price 5.16 $ 5.64 $ 6.18
Vested and expected to vest, Weighted Avg. Exercise Price $ 3.67    
Outstanding Wtd. Avg. Remaining Contractual Life 6 years 3 months 18 days 5 years 10 months 24 days  
Exercisable, Wtd. Avg. Remaining Contractual Life 4 years 1 month 6 days    
Vested and expected to vest, Wtd. Avg. Remaining Contractual Life 6 years    
Aggregate Intrinsic Value, beginning balance   $ 7  
Aggregate Intrinsic Value, Exercised $ 28    
Aggregate Intrinsic Value, Canceled / Expired 22    
Aggregate Intrinsic Value, ending balance 171    
Exercisable, Aggregate Intrinsic Value 35    
Vested and expected to vest, Aggregate Intrinsic Value $ 133