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Summary of Additional Information Regarding Outstanding and Exercisable Options under Stock Based Compensation Plans (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number of Shares | shares 4,656,888
Options Outstanding, Weighted Average Remaining Contractual Life 6 years 9 months 29 days
Options Outstanding, Weighted Average Exercise Price $ 4.30
Options Exercisable, Number of Shares | shares 3,384,238
Options Exercisable, Weighted Average Exercise Price $ 5.44
$0.87-$1.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Exercise Price 0.87
Maximum Exercise Price $ 1.00
Options Outstanding, Number of Shares | shares 1,157,250
Options Outstanding, Weighted Average Remaining Contractual Life 9 years 10 months 24 days
Options Outstanding, Weighted Average Exercise Price $ 0.88
Options Exercisable, Number of Shares | shares 206,250
Options Exercisable, Weighted Average Exercise Price $ 0.88
$1.37-$1.83  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Exercise Price 1.37
Maximum Exercise Price $ 1.83
Options Outstanding, Number of Shares | shares 341,668
Options Outstanding, Weighted Average Remaining Contractual Life 8 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price $ 1.45
Options Exercisable, Number of Shares | shares 197,147
Options Exercisable, Weighted Average Exercise Price $ 1.51
$2.08-$2.79  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Exercise Price 2.08
Maximum Exercise Price $ 2.79
Options Outstanding, Number of Shares | shares 810,000
Options Outstanding, Weighted Average Remaining Contractual Life 6 years
Options Outstanding, Weighted Average Exercise Price $ 2.28
Options Exercisable, Number of Shares | shares 703,999
Options Exercisable, Weighted Average Exercise Price $ 2.21
$3.45 - $4.41  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Exercise Price 3.45
Maximum Exercise Price $ 4.41
Options Outstanding, Number of Shares | shares 564,517
Options Outstanding, Weighted Average Remaining Contractual Life 7 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price $ 3.82
Options Exercisable, Number of Shares | shares 498,712
Options Exercisable, Weighted Average Exercise Price $ 3.87
$6.24-$7.56  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Exercise Price 6.24
Maximum Exercise Price $ 7.56
Options Outstanding, Number of Shares | shares 1,466,953
Options Outstanding, Weighted Average Remaining Contractual Life 4 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price $ 6.99
Options Exercisable, Number of Shares | shares 1,466,953
Options Exercisable, Weighted Average Exercise Price $ 7.00
$13.38  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Exercise Price $ 13.38
Options Outstanding, Number of Shares | shares 316,500
Options Outstanding, Weighted Average Remaining Contractual Life 7 years
Options Outstanding, Weighted Average Exercise Price $ 13.38
Options Exercisable, Number of Shares | shares 311,177
Options Exercisable, Weighted Average Exercise Price $ 13.38