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Fair Value Measurements - Financial Instruments Measured on a Recurring Basis (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Phantom Stock Units    
Financial instruments measured at fair value on a recurring basis    
Expected life (years) 2 years 9 months  
Expected dividends $ 0  
Minimum | Phantom Stock Units    
Financial instruments measured at fair value on a recurring basis    
Grant date fair value (in dollars per share) $ 1.70  
Risk-free interest rate 0.27%  
Expected life (years) 2 years 8 months 15 days  
Estimated volatility factor (percent) 65.10%  
Maximum | Phantom Stock Units    
Financial instruments measured at fair value on a recurring basis    
Grant date fair value (in dollars per share) $ 7.28  
Risk-free interest rate 2.39%  
Estimated volatility factor (percent) 69.90%  
Recurring    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability $ 844,000 $ 123,000
Level 1 to level 2 transfers 0  
Transfers 0  
Recurring | Level 1    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability 0 0
Recurring | Level 2    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability 0 0
Recurring | Level 3    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability 844,000 123,000
Liability-classified stock compensation | Recurring    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability 265,000 218,000
Liability-classified stock compensation | Recurring | Level 1    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability 0 0
Liability-classified stock compensation | Recurring | Level 2    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability 0 0
Liability-classified stock compensation | Recurring | Level 3    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability 265,000 218,000
Derivative financial instruments, liabilities | Recurring | Interest rate swap    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability 579,000 (95,000)
Derivative financial instruments, liabilities | Recurring | Level 1 | Interest rate swap    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability 0 0
Derivative financial instruments, liabilities | Recurring | Level 2 | Interest rate swap    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability 0 0
Derivative financial instruments, liabilities | Recurring | Level 3 | Interest rate swap    
Financial instruments measured at fair value on a recurring basis    
Fair value of liability $ 579,000 $ (95,000)