Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Stock Plans - Schedule of Restricted Stock Award Activity (Detail) - Restricted Stock Awards [Member]
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Unvested, Beginning Balance | shares 72,208
Shares, Vested | shares (31,245)
Shares, Unvested, Ending Balance | shares 40,963
Weighted Average Grant Date Fair Value, Unvested, Beginning Balance | $ / shares $ 7.26
Weighted Average Grant Date Fair Value, Vested | $ / shares 6.95
Weighted Average Grant Date Fair Value, Unvested, Ending Balance | $ / shares $ 7.50