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Stockholders' Equity - Summary of Stock Options Exercisable (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Exercisable | shares 1,822,218
Aggregate Intrinsic Value | $ $ 561
$1.00 - 5.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum $ 1.00
Range of Exercise Prices, maximum $ 5.00
Number Exercisable | shares 1,400,022
Weighted Average Remaining Contractual Life (Years) 3 years 5 months 23 days
Weighted Average Exercise Price $ 3.04
$5.01 - 10.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 5.01
Range of Exercise Prices, maximum $ 10.00
Number Exercisable | shares 345,257
Weighted Average Remaining Contractual Life (Years) 5 years 5 months 5 days
Weighted Average Exercise Price $ 6.28
$ 10.01 - 15.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 10.01
Range of Exercise Prices, maximum $ 15.00
Number Exercisable | shares 35,439
Weighted Average Remaining Contractual Life (Years) 7 years 1 month 16 days
Weighted Average Exercise Price $ 13.15
$15.01 - 20.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 15.01
Range of Exercise Prices, maximum $ 20.00
Number Exercisable | shares 41,500
Weighted Average Remaining Contractual Life (Years) 6 years 9 months
Weighted Average Exercise Price $ 16.27