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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts receivable, allowance $ 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 225,000,000us-gaap_CommonStockSharesAuthorized 112,500,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 80,404,000us-gaap_CommonStockSharesIssued 71,859,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 80,404,000us-gaap_CommonStockSharesOutstanding 71,859,000us-gaap_CommonStockSharesOutstanding