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Stockholders' Equity - Summary of Stock Options Outstanding (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Range of Exercise Price, $0.73 - 0.82 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Range of Exercise Price, minimum $ 0.73
Options Outstanding, Range of Exercise Price, maximum $ 0.82
Number of Options Outstanding | shares 2,315,351
Options Outstanding, Weighted-Average Remaining Contractual Life(In years) 5 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price $ 0.78
Number of Options Exercisable | shares 2,315,351
Options Exercisable, Weighted-Average Exercise Price $ 0.78
Range of Exercise Price, $0.88 - 0.88 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Range of Exercise Price, minimum 0.88
Options Outstanding, Range of Exercise Price, maximum $ 0.88
Number of Options Outstanding | shares 3,175,642
Options Outstanding, Weighted-Average Remaining Contractual Life(In years) 7 years 10 months 17 days
Options Outstanding, Weighted-Average Exercise Price $ 0.88
Number of Options Exercisable | shares 2,088,488
Options Exercisable, Weighted-Average Exercise Price $ 0.88
Range of Exercise Price, $1.00 - 1.14 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Range of Exercise Price, minimum 1.00
Options Outstanding, Range of Exercise Price, maximum $ 1.14
Number of Options Outstanding | shares 303,750
Options Outstanding, Weighted-Average Remaining Contractual Life(In years) 7 years 2 months 5 days
Options Outstanding, Weighted-Average Exercise Price $ 1.05
Number of Options Exercisable | shares 234,187
Options Exercisable, Weighted-Average Exercise Price $ 1.05
Range of Exercise Price, $1.16 - 1.16 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Range of Exercise Price, minimum 1.16
Options Outstanding, Range of Exercise Price, maximum $ 1.16
Number of Options Outstanding | shares 2,979,930
Options Outstanding, Weighted-Average Remaining Contractual Life(In years) 8 years 11 months 19 days
Options Outstanding, Weighted-Average Exercise Price $ 1.16
Number of Options Exercisable | shares 1,684,685
Options Exercisable, Weighted-Average Exercise Price $ 1.16
Range of Exercise Price, $1.19 - 1.20 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Range of Exercise Price, minimum 1.19
Options Outstanding, Range of Exercise Price, maximum $ 1.20
Number of Options Outstanding | shares 269,293
Options Outstanding, Weighted-Average Remaining Contractual Life(In years) 8 years 7 months 2 days
Options Outstanding, Weighted-Average Exercise Price $ 1.19
Number of Options Exercisable | shares 77,293
Options Exercisable, Weighted-Average Exercise Price $ 1.20
Range of Exercise Price, $1.21 - 1.21 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Range of Exercise Price, minimum 1.21
Options Outstanding, Range of Exercise Price, maximum $ 1.21
Number of Options Outstanding | shares 3,474,526
Options Outstanding, Weighted-Average Remaining Contractual Life(In years) 6 years 29 days
Options Outstanding, Weighted-Average Exercise Price $ 1.21
Number of Options Exercisable | shares 3,371,987
Options Exercisable, Weighted-Average Exercise Price $ 1.21
Range of Exercise Price, $1.24 - 2.04 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Range of Exercise Price, minimum 1.24
Options Outstanding, Range of Exercise Price, maximum $ 2.04
Number of Options Outstanding | shares 1,931,600
Options Outstanding, Weighted-Average Remaining Contractual Life(In years) 7 years 6 months
Options Outstanding, Weighted-Average Exercise Price $ 1.47
Number of Options Exercisable | shares 1,434,047
Options Exercisable, Weighted-Average Exercise Price $ 1.45
Range of Exercise Price, $2.09 - 2.09 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Range of Exercise Price, minimum 2.09
Options Outstanding, Range of Exercise Price, maximum $ 2.09
Number of Options Outstanding | shares 3,893,646
Options Outstanding, Weighted-Average Remaining Contractual Life(In years) 5 years 8 months 9 days
Options Outstanding, Weighted-Average Exercise Price $ 2.09
Number of Options Exercisable | shares 3,338,316
Options Exercisable, Weighted-Average Exercise Price $ 2.09
Range of Exercise Price, $2.13 - 2.80 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Range of Exercise Price, minimum 2.13
Options Outstanding, Range of Exercise Price, maximum $ 2.80
Number of Options Outstanding | shares 2,911,527
Options Outstanding, Weighted-Average Remaining Contractual Life(In years) 3 years 7 months 2 days
Options Outstanding, Weighted-Average Exercise Price $ 2.27
Number of Options Exercisable | shares 2,880,589
Options Exercisable, Weighted-Average Exercise Price $ 2.27
Range of Exercise Price, $3.01 - 6.30 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Range of Exercise Price, minimum 3.01
Options Outstanding, Range of Exercise Price, maximum $ 6.30
Number of Options Outstanding | shares 7,206,883
Options Outstanding, Weighted-Average Remaining Contractual Life(In years) 1 year 11 months 23 days
Options Outstanding, Weighted-Average Exercise Price $ 4.02
Number of Options Exercisable | shares 7,206,883
Options Exercisable, Weighted-Average Exercise Price $ 4.02
Range of Exercise Price, $0.73 - 6.30 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Range of Exercise Price, minimum 0.73
Options Outstanding, Range of Exercise Price, maximum $ 6.30
Number of Options Outstanding | shares 28,462,148
Options Outstanding, Weighted-Average Remaining Contractual Life(In years) 5 years 3 months 15 days
Options Outstanding, Weighted-Average Exercise Price $ 2.09
Number of Options Exercisable | shares 24,631,826
Options Exercisable, Weighted-Average Exercise Price $ 2.22