Quarterly report pursuant to Section 13 or 15(d)

Summary of Unvested Restricted Stock Units (Detail)

v3.19.1
Summary of Unvested Restricted Stock Units (Detail) - Restricted Stock Units (RSUs)
shares in Thousands
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Shares  
Beginning Balance | shares 2,037
Granted | shares 40
Vested | shares (220)
Forfeited or cancelled | shares (64)
Ending Balance | shares 1,793
Weighted Average Grant Date Fair Value  
Unvested RSUs at December 31, 2018 | $ / shares $ 1.84
Granted | $ / shares 2.08
Vested | $ / shares 2.28
Forfeited or cancelled | $ / shares 2.62
Unvested RSUs at March 31, 2019 | $ / shares $ 1.76