Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Accumulated amortization of debt issuance costs	$ 601	$ 716
Stockholders' deficit
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	175,000,000us-gaap_CommonStockSharesAuthorized	175,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	107,103,262us-gaap_CommonStockSharesIssued	102,613,780us-gaap_CommonStockSharesIssued
Common stock, shares outsatnding	107,103,262us-gaap_CommonStockSharesOutstanding	102,613,780us-gaap_CommonStockSharesOutstanding

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