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Fair Value Measurements - Changes of Level 3 Financial Instruments (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
Recurring  
Financial instruments measured at Level 3 fair value on a recurring basis  
Transfers between Level 2 and Level 1 $ 0
Transfers between Level 1 and Level 2 0
Transfers 0
Liability-classified stock compensation | Level 3  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Stock compensation activity 33,000
Balance, ending period 315,000
Liability-classified stock compensation | Level 3 | Recurring  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period 282,000
Term loan  
Financial instruments measured at Level 3 fair value on a recurring basis  
Fair value of debt $ 263,900,000