Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2017	$ 49,474		$ 58,544		$ (9,070)
Begining Balance, shares at Dec. 31, 2017		10,307,247
Issuance of common stock	10		10
Issuance of common stock, shares		2,368
Stock-based compensation expense	65		65
Net loss	(2,150)				(2,150)
Ending balance at Mar. 31, 2018	47,399		58,619		(11,220)
Ending Balance, shares at Mar. 31, 2018		10,309,615
Beginning balance at Dec. 31, 2018	113,226		133,183	$ 2	(19,959)
Begining Balance, shares at Dec. 31, 2018		14,428,916
Issuance of common stock	44		44
Issuance of common stock, shares		14,653
Stock-based compensation expense	313		313
Unrealized gain on investments	14			14
Net loss	(4,111)				(4,111)
Ending balance at Mar. 31, 2019	$ 109,486		$ 133,540	$ 16	$ (24,070)
Ending Balance, shares at Mar. 31, 2019		14,443,569