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Long-Term Related Party Payable - Warrant Fair Value Assumptions (Details) - Warrants
12 Months Ended
Dec. 31, 2017
$ / shares
Schedule of Capitalization, Long-term Debt [Line Items]  
Stock price (in dollars per share) $ 8.20
Weighted average exercise price per share (in dollars per share) $ 8.63
Expected term (years) 3 months
Expected volatility 37.90%
Risk-free interest rate 1.39%
Expected dividend yield 0.00%