CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net cash used in operating activities	$ (1,407)	$ (1,760)
Cash flows from investing activities:
Proceeds from sale of asset	39	1,249
Acquisitions of property, plant and equipment	(25)	(28)
Net cash from investing activities	14	1,221
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs	337
Net cash from financing activities	337
Net increase in cash and cash equivalents	(1,056)	(539)
Cash and cash equivalents, beginning of period	3,293	3,250
Cash and cash equivalents, end of period	$ 2,237	$ 2,711