Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 9,718	$ 11,241
Restricted cash	167	169
Short-term investments	15,428	14,356
Accounts receivable, net	346	733
Inventories	1,798	2,130
Other inventory supplies	143	183
Prepaid expenses and other current assets	111	109
Assets held for sale	4,145	4,145
Total current assets	31,856	33,066
Property and equipment, net	2,689	2,728
Total assets	34,545	35,794
Liabilities and stockholders' equity
Accounts payable	250	400
Accrued payroll	71	28
Accrued and other current liabilities	506	345
Corporate income and franchise taxes	288	286
Accrued real estate taxes	112	96
Advance payments	22	39
Total current liabilities	1,249	1,194
Total liabilities	1,249	1,194
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 2,919,542 shares issued; 2,706,463 and 2,733,601 shares outstanding	29	29
Additional paid-in capital	376,307	375,979
Treasury stock, at cost, 248,790 and 185,941 shares	(12,714)	(12,213)
Accumulated other comprehensive income/(loss)	(1)	(2)
Accumulated deficit	(330,325)	(329,193)
Total stockholders' equity	33,296	34,600
Total liabilities and stockholders' equity	$ 34,545	$ 35,794