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
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gain due to change in value of note payable $ (232) $ 34
Gain due to expiration of warrant liability $ 7,294 $ (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  
Gain due to change in value of note payable $ (232)  
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 due to expiration of warrant liability $ 7,294