Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Rollforward (Details)

v3.7.0.1
Fair Value Measurements - Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Change in fair value $ (137) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ (137) $ 0 $ 0
Fair Value, Measurements, Recurring                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Balance at December 31, 2016 893               893    
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Balance at December 31, 2015       $ 0         0    
Issuance of warrant instrument                 1,030    
Change in fair value                 (137)    
Balance at December 31, 2016 $ 893       $ 0       $ 893 $ 0