XML 58 R43.htm IDEA: XBRL DOCUMENT v3.21.1
Stock-based Compensation Expense - Summary of Restricted Stock Activity under 2019 Plan and 2016 Plan (Details) - 2019 Plan and 2016 Plan - Restricted Stock
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Unvested, Beginning balance | shares 82,978
Number of Shares, Vested | shares (26,696)
Number of Shares, Repurchased | shares (1,836)
Number of Shares, Unvested, Ending balance | shares 54,446
Weighted Average Grant Date Fair Value, Unvested, Beginning balance | $ / shares $ 3.19
Weighted Average Grant Date Fair Value, Vested | $ / shares 3.09
Weighted Average Grant Date Fair Value, Repurchased | $ / shares 3.22
Weighted Average Grant Date Fair Value, Unvested, Ending balance | $ / shares $ 3.24