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Stockholders' Equity - Common Stock and Warrants (Details)
Dec. 21, 2016
USD ($)
$ / shares
Mar. 31, 2017
item
shares
Dec. 31, 2016
shares
Convertible Debt      
Authorized number of shares of common stock | shares   250,000,000 250,000,000
Voting right for each share held, number | item   1  
2016 Convertible Notes | Convertible Notes      
Convertible Debt      
Aggregate principle amount $ 250,000,000    
Debt conversion ratio (in shares) 0.1633987    
Increment used for debt conversion $ 1,000    
Conversion price (in dollars per share) | $ / shares $ 6.12    
2016 Convertible Notes | Convertible Notes | Common Stock      
Convertible Debt      
Debt conversion ratio (in shares) 0.1633987    
Increment used for debt conversion $ 1,000    
Conversion price (in dollars per share) | $ / shares $ 6.12