Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (12,102,000)	$ (8,410,000)
Reconciliation of net loss to net cash used in operating activities
Depreciation	724,000	1,236,000
Amortization of intellectual property	90,000	90,000
Accretion of asset retirement obligation	0	24,000
Fair value of RSUs issued for consulting services	34,000	24,000
Stock-based compensation	1,299,000	1,510,000
Amortization of deferred financing costs	0	18,000
Inventory NRV adjustment	146,000	0
Loss on disposal of property and equipment	4,254,000	0
Forgiveness of PPP Loan	(332,000)	0
Changes in operating assets and liabilities
Accounts receivable	(258,000)	244,000
Inventory	283,000	49,000
Prepaid expenses and other current assets	320,000	733,000
Accounts payable	222,000	(1,953,000)
Accrued expenses	680,000	(1,671,000)
Other assets and liabilities	(300,000)	(217,000)
Net cash used in operating activities	(4,940,000)	(8,323,000)
Cash flows from investing activities:
Purchases of property and equipment	(1,217,000)	(2,239,000)
Proceeds from sale of equipment	275,000	0
Equipment deposits and other assets	43,000	(36,000)
Insurance proceeds	0	7,625,000
Investment in LiNiCo	(232,000)	0
Net cash (used in) provided by investing activities	(1,131,000)	5,350,000
Cash flows from financing activities:
Proceeds from PPP Loan	0	332,000
Payments on notes payable	0	(158,000)
Lease of building	184,000	0
Proceeds from exercise of stock options	727,000	0
Proceeds from ATM, net	9,331,000	0
Net cash provided by financing activities	10,242,000	174,000
Net increase (decrease) in cash and cash equivalents	4,171,000	(2,799,000)
Cash and cash equivalents at beginning of period	6,533,000	7,575,000
Cash and cash equivalents at end of period	10,704,000	4,776,000
Supplemental disclosure of cash flows information
Cash paid for income taxes	2,000	2,000
Cash paid for interest	0	308,000
Supplemental disclosure of non-cash transactions
Change in accounts receivable resulting from insurance funds held in escrow	0	4,875,000
Change in property and equipment resulting from change in accounts payable	538,000	(994,000)
Change in property and equipment resulting from change in accrued expenses	0	(287,000)
Change in equity resulting from change in accrued expenses	0	24,000
Change in investing activity resulting from issuance of equity	$ (1,268,000)	$ 0