Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Fair Value of Notes Payable (Details)

v3.8.0.1
Fair Value Measurements - Summary of Fair Value of Notes Payable (Details) - Significant Unobservable Inputs (Level 3) - Fair value measurements, recurring
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Notes Payable to VenturEast | VenturEast  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 156
Change in fair value (17)
Ending balance 139
Warrant Liability  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance 4,403
Change in fair value (692)
Ending balance $ 3,711