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Stockholders' Equity - Summary of Stock Options Exercisable (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Exercisable | shares 2,639,560
Aggregate Intrinsic Value | $ $ 0
$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 1,605,457
Weighted Average Remaining Contractual Life (Years) 3 years 3 months 18 days
Weighted Average Exercise Price $ 3.05
$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 960,297
Weighted Average Remaining Contractual Life (Years) 2 years 3 months 4 days
Weighted Average Exercise Price $ 6.45
$ 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 25,117
Weighted Average Remaining Contractual Life (Years) 8 years 29 days
Weighted Average Exercise Price $ 13.27
$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 48,689
Weighted Average Remaining Contractual Life (Years) 7 years 9 months 4 days
Weighted Average Exercise Price $ 16.30