Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		10 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020
Cash flows from operating activities:
Net loss	$ (1,837)	$ (11,316)	$ (10,247)	$ (33,525)
Reconciliation of net loss to net cash used in operating activities
Depreciation			1,835	2,987
Amortization of intellectual property			135	137
Accretion of asset retirement obligation			36	34
Fair value of common stock issued for consulting services			24	4,075
Stock-based compensation			2,032	2,899
Warrant expense			0	4,046
Amortization of deferred financing costs			27	47
Non-cash convertible note interest expense			0	2,556
Non-cash interest expense			0	95
Loss on disposal of Ebonex asset			0	90
Loss on disposal of equipment			76	79
Changes in operating assets and liabilities
Accounts receivable			244	(988)
Inventory			123	(1,058)
Prepaid expenses and other current assets			492	(507)
Accounts payable			(1,853)	2,763
Accrued expenses			(1,543)	(1,914)
Deferred rent			0	(35)
Other assets and liabilities			(373)	(372)
Net cash used in operating activities			(8,992)	(18,591)
Cash flows from investing activities:
Purchases of property and equipment			(2,999)	(8,146)
Proceeds from sale of equipment			150	0
Equipment deposits and other assets			(28)	(1,122)
Insurance proceeds			9,838	0	$ 21,800
Net cash provided by (used in) investing activities			6,961	(9,268)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of transaction costs			0	29,380
Proceeds from PPP Loan			332	0
Payments on notes payable			(241)	(221)
Payments on convertible note			0	(6,651)
Net cash provided by financing activities			91	22,508
Net decrease in cash and cash equivalents			(1,940)	(5,351)
Cash and cash equivalents at beginning of period			7,575	20,892
Cash and cash equivalents at end of period	$ 5,635	$ 15,541	5,635	15,541	$ 5,635
Supplemental disclosure of cash flows information
Cash paid for income taxes			2	2
Cash paid for interest			448	454
Supplemental disclosure of non-cash transactions
Change in accounts receivable resulting from insurance funds held in escrow			7,600	0
Change in property and equipment resulting from change in accounts payable			(1,263)	(437)
Change in property and equipment resulting from change in accrued expenses			(409)	(259)
Change in equity resulting from change in accrued expenses			$ 24	$ 1,300