Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 10,152	$ 11,544
Restricted cash	169	181
Short-term investments	14,579	6,451
Accounts receivable, net	786	718
Inventories	2,562	3,030
Other inventory supplies	185	837
Prepaid expenses and other current assets	140	270
Assets held for sale	4,145	11,202
Total current assets	32,718	34,233
Property and equipment, net	2,773	815
Total assets	35,491	35,048
Liabilities and stockholders' equity
Accounts payable	260	582
Accrued payroll	80	101
Accrued and other current liabilities	284	430
Corporate income and franchise taxes	280	294
Accrued real estate taxes	43	249
Advance payments	41	59
Total current liabilities	988	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; 2,919,183 and 2,910,334 shares issued; 2,741,699 and 2,732,850 shares outstanding	29	29
Additional paid-in capital	375,962	375,611
Treasury stock, at cost, 177,484 shares	(12,148)	(12,148)
Accumulated other comprehensive loss	(4)	(3)
Accumulated deficit	(329,336)	(330,156)
Total stockholders' equity	34,503	33,333
Total liabilities and stockholders' equity	$ 35,491	$ 35,048