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Shareholders' Equity Stock options and warrants (Details) - Award Type [Domain]
 6 Months Ended 12 Months Ended
Jun. 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 | $ $ 0 $ 28,600
Common Stock Warrants, Shares 3,518,952 3,550,956
Weighted Average Exercise Price, Warrants Outstanding | $ / warrant 14.07 14.12
Weighted Average Remaining Contractual Term warrant outstanding 1 year 7 months 24 days 2 years 1 month 13 days
Aggregate Intrinsic Value, Warrants Outstanding | $ $ 0 $ 1,000
Warrants Granted 0  
Warrants Canceled 32,004  
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 $ 19.37  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | $ $ 0  
shares, vested and expected to vest 3,518,952  
Weighted Average Exercise Price, Warrants vested & expected to vest | $ / warrant 14.07  
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 14.07  
weighted Average Remaining Contractual Term, warrants vested 1 year 7 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 6,924,459 4,427,234
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares $ 6.86 $ 9.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 7 years 9 months 7 days 6 years 11 months 5 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 2,903,188  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares $ 3.31  
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 (103,513)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price | $ / shares $ 6.52  
Stock Options Forfeited (302,450)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares $ 7.19  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 6,616,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares $ 7.00  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 7 years 8 months 9 days  
Weighted Average Remaining Contractual Term, Warrants Vested and Expect to Vest 1 year 7 months 24 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number 4,726,752  
Weighted average estimated fair value of shares granted | $ / shares $ 8.00  
Options, Vested, weighted Average Remaining Contractual Term 7 years 1 month 13 days