Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 19,375	$ 25,522
Accounts receivable, net	978	3,819
Inventory		883
Assets held for sale	441
Prepaid expenses and other current assets	1,595	992
Total current assets	22,389	31,216
Property and equipment, net	6,923	10,550
Operating lease right-of-use assets	1,146	2,452
Intangible assets, net		542
Goodwill		278
Other assets	720	472
TOTAL ASSETS	31,178	45,510
Current liabilities
Accounts payable and accrued expenses	3,115	4,148
Other current liabilities	1,520	2,106
Current portion of long-term note payable		2,059
Deferred revenue	74	168
Total current liabilities	4,709	8,481
Common stock warrant liability	6,844	5,975
Operating lease liabilities	43	1,476
Other long-term liabilities	338	723
Long-term notes payable		1,517
Total liabilities	11,934	18,172
Commitments and Contingencies (Note 16)
STOCKHOLDERS’ EQUITY
Preferred stock – 25,000,000 shares authorized, 0 shares issued and outstanding at December 31, 2021 and 2020
Common stock - $.001 par value; 250,000,000 shares authorized; 82,484,462 and 54,857,099 shares issued and outstanding at December 31, 2021 and 2020, respectively	82	55
Additional paid-in capital	527,560	505,494
Accumulated deficit	(508,398)	(478,211)
Total stockholders’ equity	19,244	27,338
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 31,178	$ 45,510