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Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs)
3 Months Ended
Mar. 31, 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 226,000
Vested, Number of RSUs | shares (152,527)
Forfeited, Number of RSUs | shares (10,871)
Ending Unvested, Number of RSUs | shares 1,430,232
Shares vested but not released, Number of RSUs | shares 425,966
Beginning Unvested, Weighted Average Fair Value | $ / shares $ 3.81
Granted, Weighted Average Fair Value | $ / shares 5.21
Vested, Weighted Average Fair Value | $ / shares 3.60
Forfeited, Weighted Average Fair Value | $ / shares 3.45
Ending Unvested, Weighted Average Fair Value | $ / shares 4.05
Shares vested but not released, Weighted Average Fair Value | $ / shares $ 3.39