CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net cash used in operating activities	$ (1,760)	$ (1,087)
Cash flows from investing activities:
Proceeds from sale of assets	1,249	115
Acquisitions of property, plant and equipment	(28)
Net cash from investing activities	1,221	115
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs		449
Net cash from financing activities		449
Net decrease in cash and cash equivalents	(539)	(523)
Cash and cash equivalents, beginning of period	3,250	2,588
Cash and cash equivalents, end of period	$ 2,711	$ 2,065