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Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Statement of Stockholders' Equity [Abstract] |
Issuance of common stock for cash, financing costs | $ 4.9

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- Definition Issuance of common stock for cash, financing costs. + References No definition available. + Details
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- References No definition available. + Details
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