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Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $)
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Mar. 31, 2015
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Dec. 31, 2014
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Mar. 31, 2014
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|---|---|---|---|
| Statement of Financial Position [Abstract] | |||
| Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001 |
| Common stock, authorized (in shares) | 100,000,000 | 100,000,000 | 100,000,000 |
| Common stock, shares issued (in shares) | 43,650,023 | 43,511,093 | 45,123,118 |
| Common stock, outstanding (in shares) | 43,650,023 | 43,511,093 | 45,123,118 |