Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2012	Dec. 31, 2011
Concentration of Credit Risk and Others Risks and Uncertainties [Abstract]
Cash, Uninsured Amount	$ 18,715	$ 29,185
Number of financial institutions holding company's cash	2
Fair Value, Liabilities Measured on Recurring Basis [Abstract]
Series 1 Warrants	4,430	4,699
Series 1 Warrants [Member]
Fair Value Assumptions [Abstract]
Warrant exercise price (in dollars per share)	$ 3.59	$ 3.59
Common share price (in dollars per share)	$ 23.93	$ 24.97
Discount rate (in hundredths)	1.04%	0.83%
Expected volatility rate (in hundredths)	115.00%	123.00%
Fair Value, Liabilities Measured on Recurring Basis [Abstract]
Series 1 Warrants	4,430	4,699
Fair Value, Inputs, Level 1 [Member]
Fair Value, Liabilities Measured on Recurring Basis [Abstract]
Series 1 Warrants	0	0
Fair Value, Inputs, Level 1 [Member] \| Series 1 Warrants [Member]
Fair Value, Liabilities Measured on Recurring Basis [Abstract]
Series 1 Warrants	0	0
Fair Value, Inputs, Level 1 [Member] \| Adjusted Cost [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	19,957	14,442
Fair Value, Inputs, Level 1 [Member] \| Adjusted Cost [Member] \| Certificates of Deposit [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	3,332	2,582
Fair Value, Inputs, Level 1 [Member] \| Adjusted Cost [Member] \| AA [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	4,185	2,014
Fair Value, Inputs, Level 1 [Member] \| Adjusted Cost [Member] \| A [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	7,261	9,846
Fair Value, Inputs, Level 1 [Member] \| Adjusted Cost [Member] \| BAA [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	5,179
Fair Value, Inputs, Level 1 [Member] \| Adjusted Cost [Member] \| Total Corporate Bonds [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	16,625	11,860
Fair Value, Inputs, Level 1 [Member] \| Unrealized Gains [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	16	2
Fair Value, Inputs, Level 1 [Member] \| Unrealized Gains [Member] \| Certificates of Deposit [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	3	2
Fair Value, Inputs, Level 1 [Member] \| Unrealized Gains [Member] \| AA [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	13	0
Fair Value, Inputs, Level 1 [Member] \| Unrealized Gains [Member] \| A [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	0	0
Fair Value, Inputs, Level 1 [Member] \| Unrealized Gains [Member] \| BAA [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	0
Fair Value, Inputs, Level 1 [Member] \| Unrealized Gains [Member] \| Total Corporate Bonds [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	13	0
Fair Value, Inputs, Level 1 [Member] \| Unrealized Losses [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	(38)	(6)
Fair Value, Inputs, Level 1 [Member] \| Unrealized Losses [Member] \| Certificates of Deposit [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	0	0
Fair Value, Inputs, Level 1 [Member] \| Unrealized Losses [Member] \| AA [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	0	(3)
Fair Value, Inputs, Level 1 [Member] \| Unrealized Losses [Member] \| A [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	(7)	(3)
Fair Value, Inputs, Level 1 [Member] \| Unrealized Losses [Member] \| BAA [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	(31)
Fair Value, Inputs, Level 1 [Member] \| Unrealized Losses [Member] \| Total Corporate Bonds [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	(38)	(6)
Fair Value, Inputs, Level 1 [Member] \| Fair Value [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	19,935	14,438
Fair Value, Inputs, Level 1 [Member] \| Fair Value [Member] \| Certificates of Deposit [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	3,335	2,584
Fair Value, Inputs, Level 1 [Member] \| Fair Value [Member] \| AA [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	4,198	2,011
Fair Value, Inputs, Level 1 [Member] \| Fair Value [Member] \| A [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	7,254	9,843
Fair Value, Inputs, Level 1 [Member] \| Fair Value [Member] \| BAA [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	5,148
Fair Value, Inputs, Level 1 [Member] \| Fair Value [Member] \| Total Corporate Bonds [Member]
Fair Value, Assets Measured on Recurring Basis [Abstract]
Investments available for sale	16,600	11,854
Fair Value, Inputs, Level 2 [Member]
Fair Value, Liabilities Measured on Recurring Basis [Abstract]
Series 1 Warrants	0	0
Fair Value, Inputs, Level 2 [Member] \| Series 1 Warrants [Member]
Fair Value, Liabilities Measured on Recurring Basis [Abstract]
Series 1 Warrants	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis [Abstract]
Series 1 Warrants	4,430	4,699
Fair Value, Liabilities, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	4,699	14,364
Gain (loss) included in earnings	(269)	5,595
Settlements	0	(15,260)
Ending Balance	4,430	4,699
Fair Value, Inputs, Level 3 [Member] \| Series 1 Warrants [Member]
Fair Value, Liabilities Measured on Recurring Basis [Abstract]
Series 1 Warrants	$ 4,430	$ 4,699

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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- Definition

Agreed upon price for the exchange of the underlying asset.

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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- Definition

Amount of gain (loss) recognized in earnings, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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- Definition

This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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Balance Type:	na
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- Definition

Number of financial institutions holding the company's cash and cash equivalents.

+ References

No definition available.

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