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Significant Accounting Policies - Common Stock Equivalents Included in Calculation of Diluted Net Income Per Common Share -10-Q (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Warrants [Member]        
Anti-dilutive securities 553,868 578,687 553,868 578,687
Stock Options and Restricted Stock Units [Member]        
Anti-dilutive securities 3,442,558 2,819,789 3,442,558 2,819,789