Quarterly report pursuant to Section 13 or 15(d)

Summary of Unvested Restricted Stock Units (Detail)

v3.19.2
Summary of Unvested Restricted Stock Units (Detail) - Restricted Stock Units (RSUs)
shares in Thousands
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Shares  
Beginning Balance | shares 2,163
Granted | shares 97
Vested | shares (794)
Forfeited or cancelled | shares (213)
Ending Balance | shares 1,253
Weighted Average Grant Date Fair Value  
Unvested RSUs at December 31, 2018 | $ / shares $ 1.84
Granted | $ / shares 2.08
Vested | $ / shares 1.74
Forfeited or cancelled | $ / shares 2.37
Unvested RSUs at June 30, 2019 | $ / shares $ 1.87