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Stock Options (Details) - Employee Stock Option [Member]
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options, Outstanding at January 1, 2016 (in shares) | shares 3,970,146
Number of Options, Granted (in shares) | shares 710,000
Number of Options, Exercised (in shares) | shares 0
Number of Options, Forfeited/Expired (in shares) | shares (124,033)
Number of Options, Outstanding at June 30, 2016 (in shares) | shares 4,556,113
Number of Options, Exercisable at June 30, 2016 (in shares) | shares 2,343,062
Number of Options, Vested and Expected to Vest at June 30, 2016 (in shares) | shares 4,556,113
Weighted - Average Exercise Price, Outstanding at January 1, 2016 (in dollars per share) | $ / shares $ 3.02
Weighted - Average Exercise Price, Granted (in dollars per shares) | $ / shares 2.67
Weighted - Average Exercise Price, Exercised (in dollars per share) | $ / shares 0
Weighted - Average Exercise Price, Forfeited/Expired (in dollars per share) | $ / shares 3.19
Weighted - Average Exercise Price, Outstanding at June 30, 2016 (in dollars per share) | $ / shares 2.96
Weighted - Average Exercise Price, Exercisable at June 30, 2016 (in dollars per share) | $ / shares 3.14
Weighted - Average Exercise Price, Vested and Expected to Vest at June 30, 2016 (in dollars per share) | $ / shares $ 2.96
Weighted - Average Remaining Contractual Term, Outstanding at June 30, 2016 (in years) 5 years 6 months 22 days
Weighted - Average Remaining Contractual Term, Exercisable at June 30, 2016 (in years) 4 years 14 days
Weighted - Average Remaining Contractual Term, Vested and Expected to Vest at June 30, 2016 (in years) 5 years 6 months 22 days
Aggregate Intrinsic Value, Outstanding at June 30, 2016 | $ $ 28,800
Aggregate Intrinsic Value, Exercisable at June 30, 2016 | $ 2,376
Aggregate Intrinsic Value, Vested and Expected to Vest at June 30, 2016 | $ $ 28,800