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Stockholders' Equity - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding at beginning of period 2,712,954 3,468,991 3,397,529
Number of Shares, Granted 2,549,177    
Number of Shares, Exercised (350,441) (202,519) (147,425)
Number of Shares, Forfeitures (502,186) (1,510,193) (434,486)
Number of Shares, Outstanding at end of period 4,406,004 2,712,954 3,468,991
Weighted Average Exercise Price Per Share, Outstanding at beginning of period $ 2.98 $ 4.14 $ 5.42
Weighted average Exercise Price Per Share, Exercised 2.00 2.17 2.01
Weighted Average Exercise Price Per Share, Forfeitures 3.48 5.13 13.17
Weighted Average Exercise Price Per Share, Outstanding at end of period $ 3.19 $ 2.98 $ 4.14
Aggregate Intrinsic Value, Outstanding at beginning of period $ 1,190 $ 0 $ 3,124
Aggregate Intrinsic Value, Granted $ 0 $ 0 $ 0
Aggregate Intrinsic Value, Outstanding at end of period $ 4,172 $ 1,190 $ 0
Officers and Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Granted 1,249,817 83,658 95,000
Weighted Average Exercise Price Per Share, Granted $ 2.49 $ 2.64 $ 2.34
Others [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Granted 1,299,360 873,017 558,373
Weighted Average Exercise Price Per Share, Granted $ 2.60 $ 1.96 $ 3.12