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Stockholders' Equity – Equity Distribution Agreement (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Jul. 31, 2017
Aug. 31, 2015
Jun. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, shares issued     22,448,735 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 $ 31.6  
Common stock, shares issued 3,655,987   2,489,884  
Net proceeds from common stock $ 4.9   $ 3.3  
Equity Distribution Agreement | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Sale of common stock, commission percentage   3.00%