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Fair Value Measurements - Changes of Level 3 Financial Instruments (Details)
6 Months Ended
Jun. 30, 2021
USD ($)
Liability-classified stock compensation | Level 3  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Stock compensation activity $ (85,000)
Balance, ending period 197,000
Term loan  
Financial instruments measured at Level 3 fair value on a recurring basis  
Fair value of debt 264,900,000
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 out of level 3 0
Recurring | Liability-classified stock compensation | Level 3  
Financial instruments measured at Level 3 fair value on a recurring basis rollforward  
Balance, beginning period 282,000
Balance, ending period $ 197,000