CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000us-gaap_CommonStockSharesAuthorized	100,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	57,458us-gaap_CommonStockSharesIssued	54,486us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	57,458us-gaap_CommonStockSharesOutstanding	54,486us-gaap_CommonStockSharesOutstanding
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000	5,000
Series A Junior Participating Preferred Stock.
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	100	100
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

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

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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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