Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Fair Value Measurements - Summary of Fair Value of Notes Payable (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gain due to expiration of warrant liability $ 7,294 $ (17)
VenturEast | Significant Unobservable Inputs (Level 3) | Fair value measurements, recurring    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 114  
Change in fair value 232  
Ending balance $ 346