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Equity Incentive Plans and Stock-Based Compensation - Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Number of Options  
Outstanding beginning of period (in shares) | shares 2,208,141
Granted (in shares) | shares 554,545
Exercised (in shares) | shares (101,103)
Forfeited (in shares) | shares (363,401)
Expired (in shares) | shares (101,416)
Outstanding end of period (in shares) | shares 2,196,766
Exercisable (in shares) | shares 1,357,114
Vested and expected to vest (in shares) | shares 2,047,715
Weighted Average Exercise Price  
Outstanding beginning of period (in dollars per share) | $ / shares $ 10.57
Granted (in dollars per share) | $ / shares 12.07
Exercised (in dollars per share) | $ / shares 9.63
Forfeited (in dollars per share) | $ / shares 12.74
Expired (in dollars per share) | $ / shares 13.99
Outstanding end of period (in dollars per share) | $ / shares 10.47
Exercisable (in dollars per share) | $ / shares 9.63
Vested and expected to vest (in dollars per share) | $ / shares $ 10.38
Weighted Average Remaining Contractual Term  
Outstanding 6 years 3 months 10 days
Exercisable 4 years 11 months 12 days
Vested and expected to vest 6 years 1 month 17 days
Aggregate Intrinsic Value  
Ending balance | $ $ 1,478
Exercisable | $ 1,464
Vested and expected to vest | $ $ 1,475