Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Liabilities (Details)

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Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Liabilities (Details) - Warrant Liabilities [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 10,464
Decrease in estimated fair value of contingent warrant liabilities upon revaluation $ (10,464)