Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Convertible Preferred Stock
Beginning and ending balances for the Company's fair value measurements using Level 3 inputs
Asset, Beginning Balance	13,300	25,720	25,720
Unrealized gains (losses) included in other comprehensive income	0	(5,190)
Asset, Ending Balance	13,300	20,530
Asset fair value	13,300	20,530
Level 3 \| Convertible Preferred Stock
Beginning and ending balances for the Company's fair value measurements using Level 3 inputs
Asset, Ending Balance	13,300	20,530	13,300
Asset fair value	13,300	20,530	13,300
Market Approach Valuation Technique \| Level 3 \| Convertible Preferred Stock
Beginning and ending balances for the Company's fair value measurements using Level 3 inputs
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	6.61	7.75	7.00
Income Approach Valuation Technique \| Level 3 \| Convertible Preferred Stock
Beginning and ending balances for the Company's fair value measurements using Level 3 inputs
Fair Value Inputs, Discount Rate	14.50%	14.50%	14.50%

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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.

+ 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 (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Market valuation of entity divided by earnings before interest, taxes, depreciation, and amortization (EBITDA), used as an input to measure fair value.

+ References

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ 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)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ 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)(1a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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