XML 72 R60.htm IDEA: XBRL DOCUMENT v3.21.1
Stock Incentive Plans - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Jan. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Mar. 25, 2019
Sep. 25, 2018
Jun. 21, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock authorized and reserved for future issuance (in shares)   30,928,290   25,157,139      
Stock‑based compensation expense   $ 1,780,000 $ 1,409,000        
Unrecognized compensation expense related to unvested non-employee stock options   $ 0          
Employee stock option grants              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock authorized and reserved for future issuance (in shares)   7,719,817   4,916,374      
Estimated forfeitures rate   10.00%          
Weighted average grant date fair value of stock options (in dollars per share)   $ 1.99 $ 1.69        
Unrecognized compensation expense related to unvested employee stock options   $ 11,800,000          
Weighted average period for recognition   2 years 8 months 12 days          
Unvested restricted stock units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grants in period (in dollars per share)   $ 2.99          
Grants in period (in shares)   468,550          
Reserved for issuance (in shares)   98,750          
Reserved for issuance (in dollars per share)   $ 2.99          
2016 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized for grants (in shares)             1,210,256
Number of shares authorized, increase (in shares)   4,322,850 3,453,022        
Common stock authorized and reserved for future issuance (in shares)   3,248,520          
2016 Plan | Unvested restricted stock units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vested in period   $ 1,400,000          
Grants in period (in shares) 369,800 98,750          
Awarded in period (in shares)   197,500          
Reserved for issuance (in shares)   98,750          
Award vesting term   4 years          
Employment Inducement Incentive Award Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized for grants (in shares)   1,358,333          
Common stock authorized and reserved for future issuance (in shares)         2,000,000 1,175,000  
Employment Inducement Incentive Award Plan | Unvested restricted stock units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average period for recognition   3 years 1 month 6 days          
Unrecognized compensation expense   $ 1,500,000          
ESPP              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized, increase (in shares)   1,080,711 863,254        
Common stock authorized and reserved for future issuance (in shares)   2,546,464         173,076
Stock‑based compensation expense   $ 100,000 $ 100,000