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Marketable Securities - Summary of Marketable Securities Treated as Available-for-Sale Securities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |  |
Total available-for-sale securities, Amortized cost | $ 197 | $ 197 | $ 27,065
Total available-for-sale securities, Gross unrealized gains | 244 | 157 | 163
Total available-for-sale securities, Gross unrealized losses | 0 | 0 | 0
Total available-for-sale securities, Fair value | 441 | 354 | 27,228
Common stock [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total available-for-sale securities, Amortized cost | 197 | 197 | 197
Total available-for-sale securities, Gross unrealized gains | 244 | 157 | 163
Total available-for-sale securities, Gross unrealized losses | 0 | 0 | 0
Total available-for-sale securities, Fair value | 441 | 354 | 360
Government and agency securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total available-for-sale securities, Amortized cost |  |  | 26,868
Total available-for-sale securities, Gross unrealized gains |  |  | 0
Total available-for-sale securities, Gross unrealized losses |  |  | 0
Total available-for-sale securities, Fair value |  |  | $ 26,868

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References 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=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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