XML 64 R47.htm IDEA: XBRL DOCUMENT v3.7.0.1
Warrants - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Class of Warrant or Right [Line Items]      
Warrants exercise price (usd per share)   $ 1.99 $ 7.14
Level 3 | Warrants      
Class of Warrant or Right [Line Items]      
Non-cash expense (income) resulting from change in estimated fair value   $ (11.9) $ (2.9)
Issued with September 2016 Convertible Notes      
Class of Warrant or Right [Line Items]      
Warrants issued to purchase common stock 18,087,500    
Warrants exercise price (usd per share) $ 1.50 $ 1.50  
Period of time after issuance for warrants to become exercisable 6 months    
Warrant exercise price 5 years