Quarterly report pursuant to Section 13 or 15(d)

Stock Plans - Schedule of Restricted Stock Award Activity (Detail)

v3.20.2
Stock Plans - Schedule of Restricted Stock Award Activity (Detail) - Restricted Stock Awards [Member]
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Unvested, Beginning Balance | shares 22,813
Shares, Granted | shares 5,310
Shares, Vested | shares (17,960)
Shares, Unvested, Ending Balance | shares 10,163
Weighted Average Grant Date Fair Value, Unvested, Beginning Balance | $ / shares $ 7.50
Weighted Average Grant Date Fair Value, Granted | $ / shares 2.98
Weighted Average Grant Date Fair Value, Vested | $ / shares 6.16
Weighted Average Grant Date Fair Value, Unvested, Ending Balance | $ / shares $ 7.50