Annual report pursuant to Section 13 and 15(d)

Stock and Employee Benefit Plans - Narrative (Details)

v3.21.1
Stock and Employee Benefit Plans - Narrative (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Jun. 23, 2020
shares
Dec. 31, 2020
USD ($)
purchasePeriod
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Defined Benefit Plan Disclosure [Line Items]      
Issuance of common stock resulting from purchase of employee stock purchase plan shares (shares)   69,544 113,112
Unrecognized compensation costs related to nonvested awards | $   $ 7.1  
Weighted-average compensation cost recognition period   2 years 1 month 20 days  
2020 Plan      
Defined Benefit Plan Disclosure [Line Items]      
Common stock authorized for issuance (shares) 3,500,000    
Maximum term of stock options   10 years  
Number of options granted (shares)   2,311,481 2,489,269
Weighted-average fair value (USD per share) | $ / shares   $ 1.92 $ 2.31
2019 Plan      
Defined Benefit Plan Disclosure [Line Items]      
Shares available for grant under prior plan (shares) 1,579,678    
Stock available for future grant (shares)   3,475,104  
Executive Officers and Senior Leadership      
Defined Benefit Plan Disclosure [Line Items]      
Number of options granted (shares)   0  
Unrecognized compensation costs related to nonvested awards | $   $ 0.6  
Employee Stock      
Defined Benefit Plan Disclosure [Line Items]      
Common stock authorized for issuance (shares)   500,000  
Discount from market price (as a percent)   85.00%  
Number of purchase periods | purchasePeriod   2  
Term of purchase period   6 months