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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Consolidated Statement of Changes in Stockholders' Equity [Abstract] |  |  |  |
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001

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