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Stock Options (Details) - Employee Stock Option [Member]
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options, Outstanding at January 1, 2017 (in shares) | shares 5,169,169
Number of Options, Granted (in shares) | shares 40,000
Number of Options, Exercised (in shares) | shares 0
Number of Options, Forfeited/Expired (in shares) | shares (75,237)
Number of Options, Outstanding at September 30, 2017 (in shares) | shares 5,133,932
Number of Options, Exercisable at September 30, 2017 (in shares) | shares 4,116,869
Number of Options, Vested and Expected to Vest at September 30, 2017 (in shares) | shares 5,133,932
Weighted - Average Exercise Price, Outstanding at January 1, 2017 (in dollars per share) | $ / shares $ 2.88
Weighted - Average Exercise Price, Granted (in dollars per shares) | $ / shares 1.50
Weighted - Average Exercise Price, Exercised (in dollars per share) | $ / shares 0
Weighted - Average Exercise Price, Forfeited/Expired (in dollars per share) | $ / shares 2.93
Weighted - Average Exercise Price, Outstanding at September 30, 2017 (in dollars per share) | $ / shares 2.87
Weighted - Average Exercise Price, Exercisable at September 30, 2017 (in dollars per share) | $ / shares 2.95
Weighted - Average Exercise Price, Vested and Expected to Vest at September 30, 2017 (in dollars per share) | $ / shares $ 2.87
Weighted - Average Remaining Contractual Term, Outstanding at September 30, 2017 (in years) 5 years 29 days
Weighted - Average Remaining Contractual Term, Exercisable at September 30, 2017 (in years) 4 years 2 months 5 days
Weighted - Average Remaining Contractual Term, Vested and Expected to Vest at September 30, 2017 (in years) 5 years 29 days
Aggregate Intrinsic Value, Outstanding at September 30, 2017 | $ $ 0
Aggregate Intrinsic Value, Exercisable at September 30, 2017 | $ 0
Aggregate Intrinsic Value, Vested and Expected to Vest at September 30, 2017 | $ $ 0