Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Details)

v3.7.0.1
Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loss (gain) due to change in value of note payable $ (13) $ (67) $ 219 $ (101)
Gain (loss) due to expiration of warrant liability 577 0 $ (6,717) 17
VenturEast | BioServe        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Number of shares associated with notes payable (in shares)     84,278  
Loss (gain) due to change in value of note payable (13) $ (67) $ 219 (101)
2016 Offering | Significant Unobservable Inputs (Level 3) | Fair value measurements, recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain (loss) due to expiration of warrant liability $ 577   $ (6,717) $ 17