Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Rollforward (Details)

v3.19.3
Fair Value Measurements - Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Change in fair value $ (973) $ 401 $ 752 $ 292
Fair value, measurements, recurring        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at December 31, 2018     2,798  
Balance at September 30, 2019 3,550   3,550  
Fair value, measurements, recurring | Significant Unobservable Inputs (Level 3)        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at December 31, 2018     2,798  
Change in fair value     752  
Balance at September 30, 2019 $ 3,550   $ 3,550