Quarterly report pursuant to Section 13 or 15(d)

4. Stock Incentive Plan (Details)

v3.21.1
4. Stock Incentive Plan (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]      
Stock options outstanding, beginning 1,258,577 1,087,463 1,087,463
Stock options, granted 196,476 [1] 163,357 174,357
Stock options, forfeited (3,344) [2]   (3,243)
Stock options, exercised (2,913)    
Stock options outstanding, ending 1,448,796   1,258,577
Weighted average exercise price outstanding, beginning $ 4.47 $ 2.94 $ 2.94
Weighted average exercise price, granted 6.93 [1]   14.08
Weighted average exercise price, forfeited 17.25 [2]   8.47
Weighted average exercise price, exercised 6.00    
Weighted average exercise price outstanding, ending $ 4.77   $ 4.47
[1] 196,476 options vest as follows: options to purchase 168,704 shares of the Company's common stock vest 6/48ths on the six-month anniversary of grant date and 1/48th per month thereafter; options to purchase 17,772 shares of the Company's common stock vest quarterly over one year; and options to purchase 10,000 shares of the Company's common stock vest monthly over one year. Exercise prices range from $5.76 to $9.67 per share.
[2] Forfeited options represent unvested shares and vested, expired shares related to employee terminations