Consolidated Balance Sheets - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 17,672,000	$ 21,216,000
Restricted cash	163,000	170,000
Short-term investments	0	8,895,000
Accounts receivable, net	2,585,000	1,738,000
Inventories	8,000,000	21,333,000
Other inventory supplies	1,486,000	5,717,000
Prepaid expenses and other current assets	1,082,000	1,188,000
Assets held for sale	14,761,000
Total current assets	45,749,000	60,257,000
Property and equipment, net	7,110,000	57,569,000
Other assets	154,000	1,416,000
Total assets	53,013,000	119,242,000
Liabilities and stockholders' equity
Accounts payable	948,000	3,256,000
Accrued payroll	182,000	164,000
Accrued and other current liabilities	602,000	1,328,000
Corporate income and franchise taxes	568,000	207,000
Accrued real estate taxes	241,000	238,000
Short-term loan payable		1,500,000
Advance payments	23,000	9,000
Total current liabilities	2,564,000	6,702,000
Deferred tax liability		554,000
Total liabilities	2,564,000	7,256,000
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.001 par value, 5,000,000 undesignated shares authorized, no shares issued or outstanding
Common stock, $0.001 par value, 40,000,000 shares authorized; 28,603,665 and 28,007,811 shares issued; 26,828,821 and 26,232,967 shares outstanding	29,000	28,000
Additional paid-in capital	374,903,000	373,565,000
Treasury stock, at cost, 1,774,844 shares	(12,148,000)	(12,148,000)
Accumulated other comprehensive loss	(30,000)	(33,000)
Accumulated deficit	(312,305,000)	(249,426,000)
Total stockholders' equity	50,449,000	111,986,000
Total liabilities and stockholders' equity	$ 53,013,000	$ 119,242,000