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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Stockholders' equity:
Convertible preferred stock, par value (in dollars per share)	$ 0.001us-gaap_PreferredStockParOrStatedValuePerShare	$ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Convertible preferred stock, Authorized shares	5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized
Convertible preferred stock, Issued shares	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Convertible preferred stock, outstanding shares	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common Stock, par value (in dollars per share)	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare	$ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Authorized shares	500,000,000us-gaap_CommonStockSharesAuthorized	500,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Issued shares	115,161,675us-gaap_CommonStockSharesIssued	113,459,390us-gaap_CommonStockSharesIssued
Common Stock, outstanding shares	115,161,675us-gaap_CommonStockSharesOutstanding	113,459,390us-gaap_CommonStockSharesOutstanding

X

- Definition

Face amount or stated value per share of common stock.

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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.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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