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
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Balance - January 1, $ 569 $ 1,476
Change in fair value of warrants (281) (769)
Balance at June 30, $ 288 $ 707