Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Summary of Stock Option Activity (Detail)

v3.6.0.2
Stockholders' Equity - Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Options outstanding at December 31, 2015, Number of Shares | shares 8,177,368
Options granted, Number of Shares | shares 1,995,000
Options exercised, Number of Shares | shares (72,843)
Options canceled, Number of Shares | shares (843,019)
Options outstanding at December 31, 2016, Number of Shares | shares 9,256,506
Options vested and expected to vest at December 31, 2016, Number of Shares | shares 8,837,719
Options exercisable at December 31, 2016, Number of Shares | shares 6,034,569
Options outstanding, Weighted-Average Exercise per Share Price, Beginning Balance | $ / shares $ 9.24
Options granted, Weighted-Average Exercise per Share Price | $ / shares 5.39
Options exercised, Weighted-Average Exercise per Share Price | $ / shares 4.05
Options canceled, Weighted-Average Exercise per Share Price | $ / shares 10.79
Options outstanding, Weighted-Average Exercise per Share Price, Ending Balance | $ / shares 8.31
Options vested and expected to vest at December 31, 2016, Weighted-Average Exercise Per Share Price | $ / shares 8.39
Options exercisable at December 31, 2016, Weighted-Average Exercise per Share Price | $ / shares $ 8.54
Options outstanding at December, 31, 2016, Weighted Average Remaining Contractual Term 5 years 6 months 7 days
Options vested and expected to vest at December, 31, 2016, Weighted Average Remaining Contractual Term 5 years 4 months 6 days
Options exercisable at December, 31, 2016, Weighted Average Remaining Contractual Term 3 years 10 months 6 days
Options outstanding at December 31, 2016, Aggregate Intrinsic Value | $ $ 41
Options vested and expected to vest at December 31, 2016, Aggregate Intrinsic Value | $ 41
Options exercisable at December 31, 2016, Aggregate Intrinsic Value | $ $ 41