Purchase Agreement, Controlled Equity Offering and Public Offering of Common Stock (Tables)

3 Months Ended

Mar. 31, 2019

Purchase Agreement Controlled Equity Offering And Public Offering Of Common Stock [Abstract]

Schedule of Amounts Offered and Sold under 2017 Sales Agreement

The amounts offered and sold under the 2017 Sales Agreement are as set forth below (in thousands, except per share amounts):

	2017 Sales Agreement
	Year Ended December 31, 2017
Total shares of common stock sold		15,998.5
Average price per share	$	3.13
Gross proceeds	$	50,000
Commissions earned by Cantor	$	1,500
Other issuance costs	$	97