Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Stock Plans - Schedule of Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member]
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Unvested, Beginning Balance | shares 142,145
Shares, Forfeited | shares (1,500)
Shares, Vested | shares (50,535)
Shares, Unvested, Ending Balance | shares 90,110
Weighted Average Grant Date Fair Value, Unvested, Beginning Balance | $ / shares $ 6.71
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 8.81
Weighted Average Grant Date Fair Value, Vested | $ / shares 5.65
Weighted Average Grant Date Fair Value, Unvested, Ending Balance | $ / shares $ 7.27