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Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events
Subsequent Events	16. Subsequent Events         The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the financial statements to provide additional evidence for certain estimates and to identify matters that require additional disclosure. Subsequent events have been evaluated as required. Sales Agreement         Subsequent to December 31, 2017, the Company sold an aggregate of 5,390,255 shares of common stock pursuant to the Second ATM Program, at an average price of $1.59 per share, for gross proceeds of $8.6 million, resulting in net proceeds of $8.3 million after deducting sales commissions and offering expenses. The Second ATM Program was fully utilized as of the date of issuance of these financial statements.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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