Quarterly report pursuant to Section 13 or 15(d)

4. Stock Incentive Plan (Tables)

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4. Stock Incentive Plan (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Stock option activity
    Options Outstanding  
    Number of Shares Subject to Options     Weighted-Average Exercise Price  
Balances at January 1, 2020     1,087,463     $ 2.94  
Granted     174,357       14.08  
Forfeited     (3,243 )     8.47  
Balances at December 31, 2020     1,258,577       4.47  
Granted(1)     196,476       6.93  
Forfeited(2)     (3,344 )     17.25  
Exercised     (2,913 )     6.00  
Balances at March 31, 2021     1,448,796       4.77  

 

(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.

  
Options outstanding
Exercise Prices   Number of Shares Subject to Options Outstanding   Weighted-Average Remaining Contractual Term in Years   Number of Shares Subject to Options Fully Vested and Exercisable   Weighted-Average Remaining Contractual Term in Years
$0.001-$5.00     557,420   5.47     555,670   5.46
$5.01-$10.00     732,519   7.98     400,390   7.28
$10.01-$15.00     146,732   8.84     74,428   8.84
$15.01-$20.00     12,125   8.09     8,583   7.81
      1,448,796         1,039,071    
Restricted stock unit activity
    Restricted Stock Units     Weighted-Average Grant Date Fair Value per Unit  
Unvested balance at January 1, 2020     —     $ —  
Granted     45,722       12.93  
Vested     (5,156 )     12.93  
Forfeited     (500 )     12.93  
Unvested balance at January 1, 2021     40,066       12.93  
Granted     124,374       6.81  
Vested     (13,021 )     11.52  
Forfeited     —       —  
Unvested Balance at March 31, 2021     151,419       8.02