Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Purchase Plan (Details)

v3.21.2
Stock-Based Compensation - Purchase Plan (Details) - Purchase Plan
1 Months Ended 9 Months Ended
Jan. 31, 2021
shares
Sep. 30, 2021
USD ($)
item
shares
Jul. 01, 2020
USD ($)
Jan. 02, 2020
USD ($)
Additional disclosures        
Award offering period   24 months    
Number of purchase periods per award offering period | item   4    
Award purchase period   6 months    
Purchase price expressed as a percentage of fair market value of common stock on the purchase date   85.00%    
Purchase price expressed as a percentage of fair market value of common stock on the first day of the offering period   85.00%    
Total incremental fair value for the Purchase Plan reset | $     $ 535,000 $ 753,000
Additional shares approved | shares 5,500,000      
Shares reserved for future issuance | shares   5,039,922    
Unrecognized compensation cost related to purchase plan | $   $ 193,000    
Weighted-average recognition period of unamortized compensation cost   3 months 29 days