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Stock Based Awards - Stock Options Outstanding and Exercisable under Stock Option Plans (Detail)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number 3,645,456
Options Exercisable and Vested, Outstanding Number 2,345,851
$1.27 - $2.53 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 1.27
Range of Exercise Price, Upper Limit | $ / shares $ 8.17
Options Outstanding, Number 819,299
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 7 months 6 days
Options Exercisable and Vested, Outstanding Number 765,419
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 4 years 7 months 6 days
$3.33 - $10.68 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 8.17
Range of Exercise Price, Upper Limit | $ / shares $ 10.87
Options Outstanding, Number 757,509
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 1 month 6 days
Options Exercisable and Vested, Outstanding Number 458,172
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 6 years 1 month 6 days
$10.87 - $20.30 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 10.88
Range of Exercise Price, Upper Limit | $ / shares $ 15.19
Options Outstanding, Number 1,003,148
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 7 months 6 days
Options Exercisable and Vested, Outstanding Number 522,356
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 7 years 7 months 6 days
$21.00 - $31.96 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 15.22
Range of Exercise Price, Upper Limit | $ / shares $ 21.30
Options Outstanding, Number 778,791
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 8 months 12 days
Options Exercisable and Vested, Outstanding Number 335,805
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 7 years 8 months 12 days
$34.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 22.24
Range of Exercise Price, Upper Limit | $ / shares $ 34.00
Options Outstanding, Number 286,709
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 1 month 6 days
Options Exercisable and Vested, Outstanding Number 264,099
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 3 years 1 month 6 days