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Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Millions	12 Months Ended
	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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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