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Shareholders' Equity - Schedule of Warrant Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Number of Shares Underling Warrants and Non- Employee Options Granted, Beginning 790,363 790,363 1,353,620
Number of Shares Underling Warrants and Non- Employee Options Granted, Exercised 0 0 (137,174)
Number of Shares Underling Warrants and Non- Employee Options Granted, Terminated (332,363) 0 (426,083)
Number of Shares Underling Warrants and Non- Employee Options Granted, Issued 0
Number of Shares Underling Warrants and Non- Employee Options Granted, Ending 458,000 790,363 790,363
Weighted Average Exercise Price, Beginning $ 5.56 $ 5.56 $ 5.64
Weighted Average Exercise Price, Exercised 0.00 0.00 4.73
Weighted Average Exercise Price, Terminated 4.36 0.00 6.09
Weighted Average Exercise Price, Issued     0.00
Weighted Average Exercise Price, Ending $ 6.43 $ 5.56 $ 5.56