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Stockholders' Equity - Restricted stock units (Details) - Restricted Stock [Member] - shares
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares, Balance at beginning of the period   682,124
Number of shares, Granted   50,000
Number of shares, Vested 0  
Number of shares, Cancelled   (53,437)
Number of shares, Balance at end of the period   678,687