Shelf Registration Statement (Details Textual) - USD ($) $ / shares in Units, shares in Thousands	1 Months Ended	9 Months Ended
	Aug. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Nov. 16, 2017
Stock Offering [Abstract]
Value of securities permitted for issuance under shelf registration				$ 125,000,000
Offering shares of common stock	7,590
Offering price per share	$ 3.25
Proceeds from sale of common stock, net of offering costs	$ 23,000,000	$ 22,974,000	$ 0