XML 155 R112.htm IDEA: XBRL DOCUMENT v3.20.4
Stock-Based Compensation - Schedule of RSU Activity (Detail) - 2018 Equity Incentive Plan [Member]
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Time-based RSU [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share equivalent, Beginning Balance | shares 1,423,392
Share equivalent, Granted | shares 2,156,079
Share equivalent, Vested | shares (619,021)
Share equivalent, Forfeited | shares (1,058,349)
Share equivalent, Cancelled | shares (17,711)
Share equivalent, Ending Balance | shares 1,884,390
Weighted-average grant date fair value, Beginning Balance | $ / shares $ 42.05
Weighted-average grant date fair value, Granted | $ / shares 8.53
Weighted-average grant date fair value, Vested | $ / shares 35.24
Weighted-average grant date fair value, Forfeited | $ / shares 25.65
Weighted-average grant date fair value, Cancelled | $ / shares 19.93
Weighted-average grant date fair value, Ending Balance | $ / shares $ 15.22
Performance-based RSUs [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share equivalent, Beginning Balance | shares 265,625
Share equivalent, Granted | shares 493,961
Share equivalent, Vested | shares (218,750)
Share equivalent, Ending Balance | shares 540,836
Weighted-average grant date fair value, Beginning Balance | $ / shares $ 7.76
Weighted-average grant date fair value, Granted | $ / shares 7.07
Weighted-average grant date fair value, Vested | $ / shares 7.76
Weighted-average grant date fair value, Ending Balance | $ / shares $ 7.13