Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Fair Value, Level 3 Rollforward (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value, Level 3 Rollforward (Details) - Significant other unobservable inputs (Level 3)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Liability Warrants  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 433
Change in value (398)
Ending balance 35
Contingently Issuable Shares  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance 4,545
Change in value (2,523)
Ending balance 2,022
Earn-out liability  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance 1,987
Change in value 4
Ending balance $ 1,991