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Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning Unvested, Number of RSUs | shares 1,367,630
Granted, Number of RSUs | shares 289,500
Vested, Number of RSUs | shares (354,669)
Forfeited, Number of RSUs | shares (27,582)
Ending Unvested, Number of RSUs | shares 1,274,879
Shares vested but not released, Number of RSUs | shares 171,850
Beginning Unvested, Weighted Average Fair Value | $ / shares $ 3.81
Granted, Weighted Average Fair Value | $ / shares 5.21
Vested, Weighted Average Fair Value | $ / shares 3.53
Forfeited, Weighted Average Fair Value | $ / shares 3.98
Ending Unvested, Weighted Average Fair Value | $ / shares 4.19
Shares vested but not released, Weighted Average Fair Value | $ / shares $ 5.38