Shareholders' Equity Activity for stock options and warrants (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 1,658,100
Common Stock, Shares, Outstanding	27,196,537	16,375,365
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	1,283,300	1,658,100
Common Stock Warrants, Shares		5,528,761
Weighted Average Exercise Price, Warrants Outstanding	16.50	15.65
Weighted Average Remaining Contractual Term warrant outstanding	2 years 7 months 17 days
Weighted Average Remaining Contractual Term, Warrants Outstanding		3 years 7 months 6 days
Aggregate Intrinsic Value, Warrants Outstanding	1,811,000	1,300,000
Warrant inducements	40,407	41,969
Share-based Compensation Arrangement by Share-based Payment Award, Options and Non-Option Equity Instruments, Outstanding [Roll Forward]
Warrants Granted	86,250
Weighted Average Exercise Price, Warrants Granted	$ 6.66
Warrants Exercised	(563,166)
Weighted Average Exercise Price, Warrants Exercised	$ 5.38
Warrants Expired	(17,500)
Weighted Average Exercise Price, Warrants Expired	$ 14.20
Warrants Canceled	(136,079)
Weighted Average Exercise Price, Warrants Canceled	$ 20.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	1,604,000
shares, vested and expected to vest	4,884,957
Weighted Average Exercise Price, Warrants vested & expected to vest	16.35
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	4,780,658
Weighted Average Exercise Price, Warrants Exercisable	15.41
weighted Average Remaining Contractual Term, warrants vested	2 years 7 months 2 days
Aggregate Intrinsic Value, Warrants vested and expected to vest	1,811,000
Aggregate Intrinsic Value, Warrants vested	$ 1,811,000
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options and Non-Option Equity Instruments, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price	$ 3.71	$ 4.10
US Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 11.19	$ 12.85
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 9 months 22 days	6 years 9 months 11 days
Common Stock, Shares, Outstanding	4,898,266
Weighted Average Remaining Contractual Term, Warrants Vested and Expect to Vest	2 years 7 months 13 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	2,816,138
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 11.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	6 years 8 months 16 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	959,167
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 7.01
Share-based Compensation Arrangement by Share-based Payment Award, Options and Non-Option Equity Instruments, Outstanding [Roll Forward]
Stock Options, Outstanding at December 31, 2011	2,168,668
Stock Options Exercised	(31,369)
Stock Options Forfeited	(74,863)
Stock Options Expired	(89,412)
Stock Options, Outstanding at September 30, 2012	2,932,191	2,168,668
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 15.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	$ 5.54
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 4.80
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	2,231,869
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price	$ 12.14
Options, Vested, weighted Average Remaining Contractual Term	6 years 4 months 24 days