Quarterly report pursuant to Section 13 or 15(d)

Basis of presentation, principles of consolidation and significant accounting policies - Fair Value Measurement (Details)

v3.10.0.1
Basis of presentation, principles of consolidation and significant accounting policies - Fair Value Measurement (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Warrant Liability – Current    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 451 $ 503
Exercise of warrants 0 (13)
Issuances of warrants   0
Change in fair value - net (82) (121)
Balance, end of period 369 369
Warrant Liability – Long-Term    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 3,202 0
Exercise of warrants 0 0
Issuances of warrants 0 4,203
Change in fair value - net (492) (1,493)
Balance, end of period 2,710 2,710
Warrant Liability – Total    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 3,653 503
Exercise of warrants 0 (13)
Issuances of warrants 0 4,203
Change in fair value - net (574) (1,614)
Balance, end of period $ 3,079 $ 3,079