Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 10,877	$ 11,130
Short-term investments	14,749	14,748
Accounts receivable, net	957	386
Inventories	703	1,073
Other inventory supplies	134	140
Prepaid expenses and other current assets	125	284
Assets held for sale	529	529
Total current assets	28,074	28,290
Inventories, non-current	468	468
Property and equipment, net	2,333	2,482
Total assets	30,875	31,240
Liabilities and stockholders’ equity
Accounts payable	596	497
Accrued payroll	344	211
Accrued and other current liabilities	237	201
Corporate income and franchise taxes	323	307
Accrued real estate taxes	57	71
Advance payments		18
Total current liabilities	1,557	1,305
Total liabilities	1,557	1,305
Commitments and contingencies
Stockholders’ equity
Preferred stock, $.001 par value, 1,000,000 undesignated shares authorized, no shares issued or outstanding
Common stock, $.001 par value, 8,200,000 shares authorized; 2,994,709 and 2,971,283 shares issued; 2,445,681 and 2,422,225 shares outstanding, respectively	29	29
Additional paid-in capital	376,645	376,456
Treasury stock, at cost, 549,028 and 549,028 shares	(15,147)	(15,147)
Accumulated deficit	(332,209)	(331,403)
Total stockholders’ equity	29,318	29,935
Total liabilities and stockholders’ equity	$ 30,875	$ 31,240