Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Fair Value, Level 3 Rollforward (Details)

v3.10.0.1
Basis of Presentation and Summary of Significant Accounting Policies - Fair Value, Level 3 Rollforward (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Public SPAC Warrants      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Change in value $ 100 $ 100 $ (300)
Significant other unobservable inputs (Level 3) | Liability Warrants      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance   20  
Change in value   (20)  
Ending balance   0  
Significant other unobservable inputs (Level 3) | Earn-Out Liabilities      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance   1,448  
Change in value   307  
Ending balance   1,755  
Significant other unobservable inputs (Level 3) | Earn-Out Liabilities      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance   114  
Change in value   0  
Ending balance   114  
Significant other unobservable inputs (Level 3) | Phantom stock options      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance   0  
Change in value   1,240  
Ending balance   $ 1,240