Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Net (Loss) income	$ (2,452)	$ 1,972
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	434	97
Stock based compensation	1,373	35
Consultant stock compensation	49
Recovery for excess and obsolete inventories	(26)	(41)
(Gain) loss on disposal of equipment	(6)	3
Changes in operating assets and liabilities:
Accounts receivable	(52)	(296)
Inventories	(303)	(161)
Prepaid expenses and other current assets	(6,273)	(138)
Other long-term assets	(753)	(302)
Accounts payable	3,698	(51)
Deferred revenue	237
Operating lease, net	9	3
Other liabilities	306	203
Accrued liabilities	981	192
Net cash (used in) provided by operating activities	(2,778)	1,516
Investing Activities
Purchases of equipment	(17,670)	(382)
Purchase of stock in equity investment		(750)
Net cash used in investing activities	(17,670)	(1,132)
Financing Activities
Proceeds from equity offering	17,250
Proceeds from preferred offering	20,165
Costs of equity offering	(1,847)
Costs of preferred offering	(1,867)
Cash dividends on preferred stock	(176)
Proceeds from stock option exercises	101
Proceeds from common stock warrant exercises	9
Net cash provided by financing activities	33,635
Increase in cash	13,187	384
Cash - beginning of period	2,630	2,510
Cash - end of period	15,817	2,894
Supplemental Disclosure of Cash Flow Information
Purchase of miner equipment using restricted stock	(207)
S-1 fees in accounts payable	$ (8)