Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 11,273	$ 8,709
Restricted cash		171
Short-term investments	10,065	15,458
Accounts receivable, net	739	1,053
Inventories	1,394	1,710
Other inventory supplies	142	140
Prepaid expenses and other current assets	458	488
Assets held for sale	3,957	3,957
Total current assets	28,028	31,686
Inventories, non-current	468	468
Property and equipment, net	2,605	2,647
Total assets	31,101	34,801
Liabilities and stockholders’ equity
Accounts payable	441	733
Accrued payroll	80	53
Accrued and other current liabilities	280	344
Corporate income and franchise taxes	313	296
Accrued real estate taxes	134	114
Advance payments		16
Total current liabilities	1,248	1,556
Total liabilities	1,248	1,556
Commitments and contingencies (Note 7)
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; 2,955,253 and 2,955,253 shares issued; 2,555,497 and 2,702,171 shares outstanding, respectively	29	29
Additional paid-in capital	376,317	376,306
Treasury stock, at cost, 399,756 and 253,082 shares	(13,954)	(12,749)
Accumulated other comprehensive income/(loss)	10	(1)
Accumulated deficit	(332,549)	(330,340)
Total stockholders’ equity	29,853	33,245
Total liabilities and stockholders' equity	$ 31,101	$ 34,801