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)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Fair value of warrants issued $ 1,004
Fair value of warrants exercised (2,696)
Notes Payable to VenturEast | 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 219
Ending balance 333
Warrant Liability | Significant Unobservable Inputs (Level 3) | Fair value measurements, recurring  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance 2,018
Fair value of warrants issued 1,004
Fair value of warrants exercised (2,696)
Change in fair value 6,717
Ending balance $ 7,043