Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Stock-Based Compensation - Summary of Activity of Restricted Stock Units (Detail) - Restricted Stock Units [Member]
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of restricted stock units outstanding, Unvested beginning balance | shares 547,807
Number of restricted stock units outstanding, Granted | shares 346,981
Number of restricted stock units outstanding, Vested | shares (165,137)
Number of restricted stock units outstanding, Forfeited | shares (153,631)
Number of restricted stock units outstanding, Unvested ending balance | shares 576,020
Weighted-average grant date fair value, Unvested beginning balance | $ / shares $ 9.49
Weighted-average grant date fair value, Granted | $ / shares 4.99
Weighted-average grant date fair value, Vested | $ / shares 7.40
Weighted-average grant date fair value, Forfeited | $ / shares 11.85
Weighted-average grant date fair value, Unvested ending balance | $ / shares $ 6.75