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Subsequent Events	3 Months Ended
	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	10. Subsequent Events Subsequent to March 31, 2017, we have received net proceeds of $18.9 million resulting from sales of 3,345,552 shares of our common stock under our 2015 ATM Agreement, through May 3, 2017.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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