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Equity Plans and Stock-Based Compensation - Option Activity under Stock-Based Compensation Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Shares Underlying Outstanding Options  
Beginning balance | shares 8,006
Options granted | shares 1,574
Options exercised | shares (7)
Ending balance | shares 9,196
Vested and expected to vest at June 30, 2020 | shares 8,932
Exercisable at June 30, 2020 | shares 5,151
Weighted-Average Exercise Price Per Share  
Beginning balance | $ / shares $ 13.86
Options granted | $ / shares 5.36
Options exercised | $ / shares 5.74
Ending balance | $ / shares 12.52
Vested and expected to vest at June 30, 2020 | $ / shares 12.72
Exercisable at June 30, 2020 | $ / shares $ 17.29
Weighted-Average Remaining Contractual Term (years)  
Balance at June 30, 2020 4 years 4 months 9 days
Vested and expected to vest at June 30, 2020 4 years 3 months 18 days
Exercisable at June 30, 2020 2 years 11 months 1 day
Aggregate Intrinsic Value  
Balance at June 30, 2020 | $ $ 13,445
Vested and expected to vest at June 30, 2020 | $ 12,626
Exercisable at June 30, 2020 | $ $ 1,168
Unvested  
Shares Underlying Outstanding Options  
Options cancelled | shares (226)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 7.43
Vested  
Shares Underlying Outstanding Options  
Options cancelled | shares (151)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 16.88