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Stock Options (Details) - Employee Stock Option [Member]
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options, Outstanding at January 1, 2018 (in shares) | shares 4,241,799
Number of Options, Granted (in shares) | shares 0
Number of Options, Exercised (in shares) | shares 0
Number of Options, Forfeited/Expired (in shares) | shares (2,824)
Number of Options, Outstanding at March 31, 2018 (in shares) | shares 4,238,975
Number of Options Exercisable at March 31, 2018 (in shares) | shares 3,680,870
Number of Options, Vested and Expected to Vest at March 31, 2018 (in shares) | shares 4,238,975
Weighted - Average Exercise Price, Outstanding at January 1, 2018 (in dollars per share) | $ / shares $ 2.82
Weighted - Average Exercise Price, Granted (in dollars per shares) | $ / shares 0
Weighted - Average Exercise Price, Exercised (in dollars per share) | $ / shares 0
Weighted - Average Exercise Price, Forfeited/Expired (in dollars per share) | $ / shares 3.39
Weighted - Average Exercise Price, Outstanding at March 31, 2018 (in dollars per share) | $ / shares 2.82
Weighted - Average Exercise Price, Exercisable atMarch 31, 2018 (in dollars per share) | $ / shares 2.86
Weighted - Average Exercise Price, Vested and Expected to Vest at March 31, 2018 (in dollars per share) | $ / shares $ 2.82
Weighted - Average Remaining Contractual Term, Outstanding at March 31, 2018 (in years) 4 years 6 months 18 days
Weighted - Average Remaining Contractual Term, Exercisable at March 31, 2018 (in years) 3 years 11 months 23 days
Weighted - Average Remaining Contractual Term, Vested and Expected to Vest at March 31, 2018 (in years) 4 years 6 months 18 days
Aggregate Intrinsic Value, Outstanding at March 31, 2018 | $ $ 0
Aggregate Intrinsic Value, Exercisable at March 31, 2018 | $ 0
Aggregate Intrinsic Value, Vested and Expected to Vest at March 31, 2018 | $ $ 0