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Convertible Notes Derivative Liability (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Closing share price (usd per share) $ 15.61
Conversion price (usd per share) $ 7.10
Risk free rate 1.76%
Expected volatility 40.00%
Dividend yield 0.00%
Expected life 3 years 6 months
Change in valuation of embedded derivative liability due to dollar change in stock price | $ $ 3.5
Change in valuation of embedded derivative liability due to percentage change in interest rates | $ $ 0.8
Embedded derivative liability  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Change in stock price (usd per share) $ 1
Change in interest rates (as a percentage) 1.00%