Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts receivable	$ 164	$ 120
Preferred stock, par value ($ per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized
Common stock, par value ($ per share)	$ 0.001	$ 0.001
Common stock, shares authorized	175,000,000us-gaap_CommonStockSharesAuthorized	175,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	66,905,839us-gaap_CommonStockSharesIssued	65,969,699us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	66,905,839us-gaap_CommonStockSharesOutstanding	65,969,699us-gaap_CommonStockSharesOutstanding
Series B junior participating preferred stock [Member]
Preferred stock, par value ($ per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,500,000	1,500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series E Convertible Voting Preferred Stock [Member]
Preferred stock, par value ($ per share)	$ 0.001	$ 0.001
Preferred stock, stated value ($ per share)	$ 10,000	$ 10,000
Preferred stock, shares authorized	2,000	2,000
Preferred stock, shares issued	20	20
Preferred stock, shares outstanding	20	20
Convertible preferred shares	40,000	40,000
Preferred stock, liquidation value	$ 240	$ 240

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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

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

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Number of shares issued for each share of convertible preferred stock that is converted.

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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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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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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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