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Stock-Based Compensation and Employee Benefit Plan - Employee Stock Purchase Plan (Details) - 2018 ESPP - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee stock ownership plan (ESOP), compensation expense $ 0.5 $ 3.2 $ 5.2 $ 8.4
Share-based compensation arrangement by share-based payment award, shares issued in period     1,937,825  
Number of additional shares authorized (in shares)     1,494,819  
Number of common stock reserved for issuance (in shares) 2,587,401   2,587,401  
Unrecognized stock-based compensation cost $ 2.6   $ 2.6  
Expense expected to be recognized over a weighted-average period     6 months