Fair Value Measurements - Summary Of Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 12,904	$ 12,904
Gross unrealized gains in Accumulated OCI	1,082	509
Gross unrealized losses in Accumulated OCI	(6,620)	(4,573)
Gain/(Loss) in Accumulated Deficit	6,856	3,232
Fair value	14,222us-gaap_AvailableForSaleSecurities	12,072us-gaap_AvailableForSaleSecurities
Common stock investments, available for sale
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,479	11,479
Gross unrealized gains in Accumulated OCI	1,082	293
Gross unrealized losses in Accumulated OCI	(6,620)	(4,573)
Gain/(Loss) in Accumulated Deficit	(1,442)	(1,441)
Fair value	4,499	5,758
Common stock options/warrants
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,425	1,425
Gross unrealized gains in Accumulated OCI	0	216
Gross unrealized losses in Accumulated OCI	0	0
Gain/(Loss) in Accumulated Deficit	8,298	4,673
Fair value	$ 9,723	$ 6,314

Available-for-Sale Securities, Accumulated Gross Realized Gain (Loss), Net

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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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.

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