Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Activity of Restricted Stock Units (Detail)

v3.20.2
Stock-Based Compensation - Summary of Activity of Restricted Stock Units (Detail) - Restricted Stock Units [Member]
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of restricted stock units outstanding, Unvested beginning balance | shares 813,526
Number of restricted stock units outstanding, Granted | shares 105,633
Number of restricted stock units outstanding, Vested | shares (242,002)
Number of restricted stock units outstanding, Forfeited | shares (61,659)
Number of restricted stock units outstanding, Unvested ending balance | shares 615,498
Weighted-average grant date fair value, Unvested beginning balance | $ / shares $ 10.31
Weighted-average grant date fair value, Granted | $ / shares 4.55
Weighted-average grant date fair value, Vested | $ / shares 9.38
Weighted-average grant date fair value, Forfeited | $ / shares 10.80
Weighted-average grant date fair value, Unvested ending balance | $ / shares $ 9.83