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Summary of Significant Accounting Policies (Details 2) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Potentially dilute securities excluded from calculation 1,563,672 3,124,545
Options to purchase common stock [Member]    
Potentially dilute securities excluded from calculation 309,037 289,380
Convertible preferred stock [Member]    
Potentially dilute securities excluded from calculation 2,926 530,277
Warrants to purchase common stock [Member]    
Potentially dilute securities excluded from calculation 1,251,709 2,304,888