Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Warrants (Details)

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Stockholders' Equity - Warrants (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2014
Class of Warrant or Right [Line Items]      
Warrants outstanding (in shares)   0 16,667,000
Exercise price of warrants (in dollars per share) $ 2.50    
Common Stock      
Class of Warrant or Right [Line Items]      
Issuance of common stock upon exercise of warrants (in shares) 6,010,000