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Stockholders' Equity – Equity Distribution Agreement (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Aug. 31, 2015
Sep. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, shares issued   40,459,427 19,734,351
Equity Distribution Agreement      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of Equity Distribution Agreement 3 years    
Value of common stock authorized $ 35.0 $ 19.8  
Common stock, shares issued   9,768,142  
Net proceeds from common stock   $ 14.9  
Equity Distribution Agreement | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Sale of common stock, commission percentage 3.00%