Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 6,023	$ 11,544
Restricted cash	179	181
Short-term investments	13,489	6,451
Accounts receivable, net	507	718
Inventories	2,788	3,030
Other inventory supplies	206	837
Prepaid expenses and other current assets	830	270
Assets held for sale	10,382	11,202
Total current assets	34,404	34,233
Property and equipment, net	412	815
Total assets	34,816	35,048
Liabilities and stockholders' equity
Accounts payable	169	582
Accrued payroll	35	101
Accrued and other current liabilities	420	430
Corporate income and franchise taxes	273	294
Accrued real estate taxes	149	249
Advance payments	34	59
Total current liabilities	1,080	1,715
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; 2,918,393 and 2,910,334 shares issued; 2,740,909 and 2,732,850 shares outstanding	29	29
Additional paid-in capital	375,903	375,611
Treasury stock, at cost, 177,484 shares	(12,148)	(12,148)
Accumulated other comprehensive loss	(2)	(3)
Accumulated deficit	(330,046)	(330,156)
Total stockholders' equity	33,736	33,333
Total liabilities and stockholders' equity	$ 34,816	$ 35,048