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Stockholders' Equity - Summary of Stock Options Exercisable (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Exercisable | shares 1,642,171
Aggregate Intrinsic Value | $ $ 653
$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
Number Exercisable | shares 1,196,693
Weighted Average Remaining Contractual Life (Years) 4 years 25 days
Weighted Average Exercise Price $ 3.15
$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
Number Exercisable | shares 375,722
Weighted Average Remaining Contractual Life (Years) 4 years 8 months 15 days
Weighted Average Exercise Price $ 6.10
$ 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
Number Exercisable | shares 38,756
Weighted Average Remaining Contractual Life (Years) 6 years 1 month 24 days
Weighted Average Exercise Price $ 13.09
$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
Number Exercisable | shares 31,000
Weighted Average Remaining Contractual Life (Years) 5 years 9 months 18 days
Weighted Average Exercise Price $ 16.20