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Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	110,000,000us-gaap_CommonStockSharesAuthorized	110,000,000us-gaap_CommonStockSharesAuthorized	110,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	44,154,572us-gaap_CommonStockSharesIssued	44,153,473us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	44,154,572us-gaap_CommonStockSharesOutstanding	44,153,473us-gaap_CommonStockSharesOutstanding

X

- Definition

Face amount or stated value per share of common stock.

+ References

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-Name Accounting Standards Codification

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X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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-Publisher FASB

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-Topic 210

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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

-Publisher FASB

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

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