Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Details)

v3.10.0.1
Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain (loss) due to change in value of note payable $ 13 $ (105) $ (68) $ 114
Repayments of notes payable     0 4,667
Gain due to expiration of warrant liability 12 2,790 $ 2,858 (3,927)
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 (loss) due to change in value of note payable (13) 105 $ 68 (114)
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     $ 2,858  
Gain (loss) on derivative warrants due to change in stock-price $ 12 $ 2,790   $ (3,927)