Stock Options and Warrants - Schedule of Stock Option Activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning balance (shares)	1,890	2,204	2,676
Granted (shares)	8	50	50
Exercised (shares)	(768)	(314)
Forfeited (shares)	(5)
Canceled (shares)	344	50	522
Options outstanding, ending balance (shares)	781	1,890	2,204	2,676
Options exercisable at December 31, 2013 (shares)	781
Range of exercise prices Granted (usd per share)	$ 7,170.00	$ 4.95	$ 1.59
Range of exercise price foreited (usd per share)	$ 4,950
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options outstanding, Weighted average exercise price per share, beginning balance (usd per share)	$ 6.63	$ 8.45	$ 6.93
Options exercised, weighted average exercise price (usd per share)	$ 4.67	$ 3.23
Granted, Weighted average exercise price per share (usd per share)		$ 4.95	$ 1.59
Forfeited, Weighted average exercise price per share (usd per share)	$ 3.87
Cancelled, Weighted average exercise price per share (usd per share)	$ 7.17	$ 12.84	$ 12.84
Options outstanding, Weighted average exercise price per share, ending balance (usd per share)	$ 6.65	$ 6.63	$ 8.45	$ 6.93
Options exercisable at December 31, 2012, Weighted average exercise price per share (usd per share)	$ 6.65
Options outstanding, Weighted average remaining contractual life	1 year 5 months 19 days	1 year 5 months 16 days	2 years 3 months 4 days	1 year 9 months 7 days
Granted, Weighted average remaining contractual life	3 years 10 months 13 days	4 years 10 months 13 days	4 years 10 months 6 days
Options exercisable, Weighted average remaining contractual life	1 year 5 months 19 days
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	$ 14.46
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Range of exercise prices Cancelled (usd per share)	$ 3.00	$ 4.71	$ 4.71
Range of exercise prices exercised (usd per share)	$ 2.79	$ 2.79
Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Range of exercise prices Cancelled (usd per share)	$ 42.75	$ 42.75	$ 26.22
Range of exercise prices exercised (usd per share)	$ 6.90	$ 4.71

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercised in Period, Exercise Price

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeited in Period, Exercise Price

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted, Weighted Average Remaining Contractual Term

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Number of options outstanding, including both vested and non-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 remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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