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Stockholders' Equity – Equity Distribution Agreement (Details) - USD ($)
1 Months Ended 3 Months Ended
Aug. 31, 2015
Mar. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, shares issued   21,953,963 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 $ 35,000,000 $ 32,400,000  
Common stock, shares issued   1,995,112  
Net proceeds from common stock   $ 2,500,000  
Equity Distribution Agreement | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Sale of common stock, commission percentage 3.00%