XML 74 R57.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Stockholders' Equity - Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Number of Shares  
Options outstanding at beginning of period (in shares) | shares 8,726,092
Options granted (in shares) | shares 4,530,288
Options exercised (in shares) | shares (806,226)
Options canceled (in shares) | shares (2,620,867)
Options outstanding at end of period (in shares) | shares 9,829,287
Options vested and expected to vest at end of period (in shares) | shares 9,829,287
Options exercisable at end of period (in shares) | shares 3,993,645
Weighted- Average Exercise per Share Price  
Options outstanding at beginning of period (in dollars per share) | $ / shares $ 11.23
Options granted (in dollars per share) | $ / shares 9.68
Options exercised (in dollars per share) | $ / shares 5.08
Options canceled (in dollars per share) | $ / shares 12.39
Options outstanding at end of period (in dollars per share) | $ / shares 10.71
Options vested and expected to vest at end of period (in dollars per share) | $ / shares 10.71
Options exercisable at end of period (in dollars per share) | $ / shares $ 10.43
Weighted-Average Remaining Contractual Term  
Options outstanding at end of period (in years) 7 years 10 months 28 days
Options vested and expected to vest at end of period (in years) 7 years 10 months 28 days
Options exercisable at end of period (in years) 6 years 6 months 14 days
Aggregate Intrinsic Value  
Options outstanding at end of period | $ $ 7,472
Options vested and expected to vest at end of period | $ 7,472
Options exercisable at end of period | $ $ 5,442