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Commitments and Contigencies - Preferred Stock Dividends (Details) - Series A Convertible Preferred Stock. - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Mar. 31, 2015
Convertible Series A Preferred Stock      
Dividend rate 8.00%    
Original issue price, per share     $ 6.70585
Cumulative unpaid dividends $ 0.5 $ 0.3