Subsequent Events (Details Narrative) - USD ($) $ in Thousands		12 Months Ended
	Jan. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Proceeds from issuance of shares		$ 25,325	$ 30,709	$ 32,862
Subsequent Event [Member] \| Underwriter [Member] \| 2017 Public Offering [Member]
Number of shares issued	1,072,500
Proceeds from issuance of shares	$ 2,100