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Shareholders' Equity Stock options and warrants (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
$ / warrant
shares
Dec. 31, 2014
USD ($)
$ / shares
$ / warrant
shares
Stock Options and Warrants [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ $ 15,200 $ 28,600
Common Stock Warrants, Shares 3,516,452 3,550,956
Weighted Average Exercise Price, Warrants Outstanding | $ / warrant 14.06 14.12
Weighted Average Remaining Contractual Term warrant outstanding 1 year 4 months 21 days 2 years 1 month 13 days
Aggregate Intrinsic Value, Warrants Outstanding | $ $ 0 $ 1,000
Warrants Granted 0  
Warrants Canceled 34,504  
Weighted Average Exercise Price, Warrants Granted | $ / shares $ 0.00  
Warrants Exercised 0  
Weighted Average Exercise Price, Warrants Exercised | $ / shares $ 0.00  
Warrants Expired 0  
Weighted Average Exercise Price, Warrants Expired | $ / shares $ 0.00  
Weighted Average Exercise Price, Warrants Canceled | $ / shares $ 19.78  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | $ $ 13,200  
shares, vested and expected to vest 3,516,452  
Weighted Average Exercise Price, Warrants vested & expected to vest | $ / warrant 14.06  
Aggregate Intrinsic Value, Warrants vested and expected to vest | $ $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $ $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 3,516,452  
Weighted Average Exercise Price, Warrants Exercisable | $ / warrant 14.06  
weighted Average Remaining Contractual Term, warrants vested 1 year 4 months 21 days  
Aggregate Intrinsic Value, Warrants vested | $ $ 0  
US Equity Plan [Member]    
Stock Options and Warrants [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 6,611,480 4,427,234
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares $ 6.82 $ 9.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 7 years 4 months 10 days 6 years 11 months 5 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 3,036,688  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares $ 3.23  
Stock Options Exercised 0  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ / shares $ 0.00  
Stock Options Expired (370,588)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price | $ / shares $ 5.32  
Stock Options Forfeited (481,854)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares $ 7.34  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 6,362,987  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares $ 6.94  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 7 years 3 months 11 days  
Weighted Average Remaining Contractual Term, Warrants Vested and Expect to Vest 1 year 4 months 21 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number 4,685,074  
Weighted average estimated fair value of shares granted | $ / shares $ 7.91  
Options, Vested, weighted Average Remaining Contractual Term 6 years 8 months 9 days