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Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs)
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning Unvested, Number of RSUs | shares 1,148,110
Granted, Number of RSUs | shares 136,396
Vested, Number of RSUs | shares (177,101)
Forfeited, Number of RSUs | shares (64,439)
Ending Unvested, Number of RSUs | shares 1,042,966
Shares vested but not released, Number of RSUs | shares 230,334
Beginning Unvested, Weighted Average Fair Value | $ / shares $ 4.43
Granted, Weighted Average Fair Value | $ / shares 2.73
Vested, Weighted Average Fair Value | $ / shares 4.02
Forfeited, Weighted Average Fair Value | $ / shares 4.65
Ending Unvested, Weighted Average Fair Value | $ / shares 4.26
Shares vested but not released, Weighted Average Fair Value | $ / shares $ 5.16