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Shareholders' Equity Stock options and warrants (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Stock Options and Warrants [Line Items] |  |  |
Stock Option Exercise | 12,800 |  |
Stock Issued During Period, Shares, Other | 0 | 3,913 |
Warrants Issued During Period, Value | $ 0 | $ 14,900 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | 1,896,700 |  |
Common Stock Warrants, Shares | 4,491,028 |  | 4,898,266
Weighted Average Exercise Price, Warrants Outstanding | 15.39 |  | 16.50
Weighted Average Remaining Contractual Term warrant outstanding | 2 years 4 months 24 days |  |
Aggregate Intrinsic Value, Warrants Outstanding | 1,661,500 |  |
Warrants Granted | 2,722 |  |
Weighted Average Exercise Price, Warrants Granted | $ 12.26 |  |
Warrants Exercised | (250,000) |  |
Weighted Average Exercise Price, Warrants Exercised | $ 5.10 |  |
Warrants Expired | (100,108) |  |
Weighted Average Exercise Price, Warrants Expired | $ 70.00 |  |
Warrants Canceled | (59,852) |  |
Weighted Average Exercise Price, Warrants Canceled | $ 57.76 |  |
Proceeds from Stock Options Exercised | 100,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | 1,848,900 |  |
shares, vested and expected to vest | 4,491,028 |  |
Weighted Average Exercise Price, Warrants vested & expected to vest | 15.39 |  |
Aggregate Intrinsic Value, Warrants vested and expected to vest | 1,661,500 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | 1,600,900 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 4,473,306 |  |
Weighted Average Exercise Price, Warrants Exercisable | 15.42 |  |
weighted Average Remaining Contractual Term, warrants vested | 2 years 3 months 18 days |  |
Aggregate Intrinsic Value, Warrants vested | $ 1,661,500 |  |
Warrants |  |  |
Stock Options and Warrants [Line Items] |  |  |
Weighted average estimated fair value of shares granted | $ 0.00 |  | $ 3.82
US Equity Plan [Member] |  |  |
Stock Options and Warrants [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 3,912,697 |  | 2,932,191
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 10.22 |  | $ 11.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | 7 years 4 months 21 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 1,169,200 |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 7.70 |  |
Stock Options Exercised | (12,800) |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ 5.58 |  |
Stock Options Expired | (109,329) |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price | $ 6.97 |  |
Stock Options Forfeited | (66,565) |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ 14.77 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | 3,596,457 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ 10.46 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term | 7 years 2 months 9 days |  |
Weighted Average Remaining Contractual Term, Warrants Vested and Expect to Vest | 2 years 4 months 24 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number | 2,520,755 |  |
Weighted average estimated fair value of shares granted | $ 11.50 |  |
Options, Vested, weighted Average Remaining Contractual Term | 6 years 5 months 27 days |  |
Minimum [Member] |  |  |
Stock Options and Warrants [Line Items] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit | $ 5.20 |  |
Maximum [Member] |  |  |
Stock Options and Warrants [Line Items] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit | $ 6.20 |  |

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