Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Stockholders' Equity:
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000us-gaap_CommonStockSharesAuthorized	100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	51,049,566us-gaap_CommonStockSharesIssued	50,065,382us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	51,049,566us-gaap_CommonStockSharesOutstanding	50,065,382us-gaap_CommonStockSharesOutstanding
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000us-gaap_PreferredStockSharesAuthorized	10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Treasury Stock, Shares	1,729,408us-gaap_TreasuryStockShares	1,729,408us-gaap_TreasuryStockShares

Face amount or stated value per share of common stock.

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