Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Reconciliation of Beginning and Ending Level 3 Liabilities (Details)

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Fair Value Measurements - Schedule of Reconciliation of Beginning and Ending Level 3 Liabilities (Details) - Unobservable Inputs Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Balance - January 1 $ 569 $ 1,476
Estimated fair value of warrants exchanged for common shares
Change in fair value of warrants (21) (571)
Balance at December 31 $ 548 $ 905