Equity Line Financing, Controlled Equity Offering and Public Offering of Common Stock (Tables)

3 Months Ended

Mar. 31, 2017

Text Block [Abstract]

Schedule of Total Sales under 2015 and 2016 Sales Agreement

The following table summarizes the total sales under the 2015 Sales Agreement and 2016 Sales Agreement for the periods indicated (in thousands, except per share amounts):

	2016 Sales Agreement		2015 Sales Agreement
	Year  Ended December 31, 2016		Year Ended December 31, 2016		Year Ended December 31, 2015
Total shares of common stock sold		8,763.4		5,710.2		2,014.3
Average price per share	$	4.70	$	3.23	$	3.25
Gross proceeds	$	41,156	$	18,454	$	6,546
Commissions earned by Cantor	$	1,235	$	553	$	197
Other issuance costs	$	185	$	—	$	259