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Stock Based Awards - Stock Options Outstanding and Exercisable under Stock Option Plans (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number 4,452,700
Options Exercisable and Vested, Outstanding Number 2,246,742
$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 $ 2.53
Options Outstanding, Number 1,158,038
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 3 months 18 days
Options Exercisable and Vested, Outstanding Number 966,139
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 6 years 3 months 18 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 $ 3.33
Range of Exercise Price, Upper Limit | $ / shares $ 10.68
Options Outstanding, Number 1,736,950
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 8 years 7 months 6 days
Options Exercisable and Vested, Outstanding Number 494,703
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 8 years 7 months 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 $ 10.87
Range of Exercise Price, Upper Limit | $ / shares $ 20.30
Options Outstanding, Number 896,382
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 8 years 6 months
Options Exercisable and Vested, Outstanding Number 409,602
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 8 years 6 months
$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 $ 21.00
Range of Exercise Price, Upper Limit | $ / shares $ 31.96
Options Outstanding, Number 651,330
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 6 months
Options Exercisable and Vested, Outstanding Number 370,048
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 7 years 6 months
$34.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 34.00
Range of Exercise Price, Upper Limit | $ / shares $ 34.00
Options Outstanding, Number 10,000
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 6 months
Options Exercisable and Vested, Outstanding Number 6,250
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 7 years 6 months