Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Common stock, par value per share (in dollars per share)	$ 0.0001	$ 0.0001
Common stock authorized (in shares)	200,000us-gaap_CommonStockSharesAuthorized	200,000us-gaap_CommonStockSharesAuthorized
Common stock issued (in shares)	54,062us-gaap_CommonStockSharesIssued	52,692us-gaap_CommonStockSharesIssued
Common stock outstanding (in shares)	54,062us-gaap_CommonStockSharesOutstanding	52,692us-gaap_CommonStockSharesOutstanding

Face amount or stated value per share of common stock.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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