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Common Stock, Share-based Awards and Warrants - Warrants Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
1 Months Ended 9 Months Ended
Aug. 31, 2015
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of additional warrants authorized for repurchase $ 20.0  
Public SPAC Warrants    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding and exercisable at June 30, 2016 (in shares)   6,173
Outstanding and exercisable at June 30, 2016 (usd per share)   $ 11.50
Outstanding and exercisable, weighted average remaining contractual term   0 years