Shareholders' Equity Stock options and warrants (Details) (USD $)	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Stock Options and Warrants [Line Items]
Stock Issued During Period, Shares, Other	20,407	38,500
Warrants Issued During Period, Value	$ 70,500	$ 166,200
Common Stock Warrants, Shares	5,054,302		5,528,761
Weighted Average Exercise Price, Warrants Outstanding	16.26		15.65
Warrants Granted	42,835
Weighted Average Exercise Price, Warrants Granted	$ 6.28
Warrants Exercised	401,215
Weighted Average Exercise Price, Warrants Exercised	$ 5.30
Warrants Expired	0
Weighted Average Exercise Price, Warrants Expired	$ 0.00
Warrants Canceled	116,079
Weighted Average Exercise Price, Warrants Canceled	$ 20.61
US Equity Plan [Member]
Stock Options and Warrants [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	2,840,668		2,168,668
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 11.12		$ 12.85
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	895,418
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 7.06
Stock Options Exercised	(16,369)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 5.29
Stock Options Expired	(86,212)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	$ 5.51
Stock Options Forfeited	(120,837)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 16.99

Common Stock Warrants, Shares

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Number of shares of stock issued during the period that is attributable to transactions involving issuance of stock not separately disclosed.

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Number of share options (or share units) exercised during the current period.

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