Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets
Cash and cash equivalents	$ 10,764	$ 11,260
Short-term investments	15,813	14,751
Accounts receivable, net	406	719
Inventories	611	658
Other inventory supplies	135	133
Prepaid expenses and other current assets	158	167
Assets held for sale	529	529
Total current assets	28,416	28,217
Inventories, non-current	457	468
Property and equipment, net	2,271	2,301
Total assets	31,144	30,986
Liabilities and stockholders’ equity
Accounts payable	292	545
Accrued payroll	496	426
Accrued and other current liabilities	52	220
Corporate income and franchise taxes	308	327
Accrued real estate taxes	97	78
Advance payments		2
Total current liabilities	1,245	1,598
Total liabilities	1,245	1,598
Commitments and contingencies (Note 8)
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; 2,995,680 and 2,995,680 shares issued; 2,446,652 and 2,446,652 shares outstanding, respectively	29	29
Additional paid-in capital	376,658	376,640
Treasury stock, at cost, 549,028 and 549,028 shares	(15,147)	(15,147)
Accumulated other comprehensive loss	(2)	(1)
Accumulated deficit	(331,639)	(332,133)
Total stockholders’ equity	29,899	29,388
Total liabilities and stockholders’ equity	$ 31,144	$ 30,986