Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Employee Stock Purchase Plan, Valuation Assumptions (Details)

v3.21.2
Stock-Based Compensation - Employee Stock Purchase Plan, Valuation Assumptions (Details) - Employee Stock - $ / shares
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Common stock purchased under the ESPP (in shares) (113,510) (161,171)
Weighted Average Grant Date Fair Value (in dollars per share) $ 10.85 $ 6.41
Risk-free interest rate 0.04% 0.15%
Dividend yield 0.00% 0.00%
Expected life (in years) 6 months 6 months 3 days
Volatility 61.10% 93.25%