Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flow from operating activities:
Net loss	$ (3,227)	$ (1,913)
Loss from discontinued operations	216	0
Loss from continuing operations	(3,011)	(1,913)
Adjustments to reconcile net loss from continuing operations to net cash used in operating activities
Depreciation and amortization	410	199
Stock and share-based compensation	392	320
Loss on disposal of property	1	88
Other	(49)	4
Changes in operating assets and liabilities:
Accounts receivable	(1,244)	(279)
Inventories	(149)	(118)
Accounts payable and accrued expenses	(134)	(639)
Commodities payable	(1,818)	176
Other	(359)	80
Net cash used in operating activities	(5,961)	(2,082)
Cash flows from investing activities:
Purchases of property and equipment	(1,160)	(745)
Net cash used in investing activities	(1,160)	(745)
Cash flows from financing activities:
Proceeds from issuance of common stock and pre-funded warrant, net of issuance costs	11,593	0
Proceeds from common stock warrant exercises	1,980	1,755
Proceeds from common stock option exercises	60	0
Payments of debt and finance lease liabilities	(278)	(1)
Net cash provided by financing activities	13,355	1,754
Net change in cash and cash equivalents and restricted cash	6,234	(1,073)
Cash and cash equivalents and restricted cash, beginning of period
Cash and cash equivalents	7,044	6,203
Restricted cash	225	775
Cash and cash equivalents and restricted cash, beginning of period	7,269	6,978
Cash and cash equivalents and restricted cash, end of period
Cash and cash equivalents	13,278	5,130
Restricted cash	225	775
Cash and cash equivalents and restricted cash, end of period	13,503	5,905
Supplemental disclosures:
Cash paid for interest	12	1
Cash paid for income taxes	$ 0	$ 0