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Common Stock	9 Months Ended
	Sep. 30, 2017
Preferred Stock Common Stock And Warrants [Abstract]
Common Stock	7. Common Stock Common Stock Outstanding As of September 30, 2017, there were 60,587,000 shares of our common stock outstanding. In August 2017, we completed an underwritten public offering of 5,750,000 shares of our common stock and received net proceeds of approximately $80.8 million. During 2017, we sold 15,997,202 shares of our common stock and received net cash proceeds of $88.2 million pursuant to an At the Market Agreement that terminated in June 2017. See Note 10.

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- Definition

Preferred stock common Stock and warrants.

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No definition available.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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