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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Convertible debt, unamortized debt discount $ 10,545us-gaap_DebtInstrumentUnamortizedDiscount $ 11,124us-gaap_DebtInstrumentUnamortizedDiscount
Preferred stock, par value (in dollars per share) $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 150,000,000us-gaap_CommonStockSharesAuthorized 150,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 80,055,550us-gaap_CommonStockSharesIssued 79,388,069us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 80,055,550us-gaap_CommonStockSharesOutstanding 79,388,069us-gaap_CommonStockSharesOutstanding
Convertible debt    
Derivative liability 98us-gaap_DerivativeLiabilities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 83us-gaap_DerivativeLiabilities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Convertible debt, unamortized debt discount $ 10,545us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 $ 11,124us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember