CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net cash used in operating activities	$ (1,630)	$ (6,205)
Cash flows from investing activities:
Proceeds from sale of assets	762	1,167
Acquisitions of property, plant and equipment	(81)	(50)
Net cash from investing activities	681	1,117
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs	1,611	3,599
Net cash from financing activities	1,611	3,599
Net increase (decrease) in cash and cash equivalents	662	(1,489)
Cash and cash equivalents, beginning of period	2,588	4,077
Cash and cash equivalents, end of period	$ 3,250	$ 2,588