Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 17,067	$ 21,216
Restricted cash	182	170
Short-term investments	1,007	8,895
Accounts receivable, net	2,737	1,738
Inventories	21,210	21,333
Other inventory supplies	5,566	5,717
Prepaid expenses and other current assets	586	1,188
Assets held for sale	1,329
Total current assets	49,684	60,257
Property and equipment, net	53,027	57,569
Other assets	868	1,416
Total assets	103,579	119,242
Liabilities and stockholders' equity
Accounts payable	3,664	3,256
Accrued payroll	220	164
Accrued and other current liabilities	422	1,328
Corporate income and franchise taxes	110	207
Accrued real estate taxes	234	238
Short-term loan payable	1,500	1,500
Advance payments	29	9
Total current liabilities	6,179	6,702
Deferred tax liability	218	554
Total liabilities	6,397	7,256
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 and 28,602,354 and 28,007,811 shares issued; 26,827,510 and 26,232,967 shares outstanding	29	28
Additional paid-in capital	374,293	373,565
Treasury stock, at cost, 1,774,844 shares	(12,148)	(12,148)
Accumulated other comprehensive loss	(24)	(33)
Accumulated deficit	(264,968)	(249,426)
Total stockholders' equity	97,182	111,986
Total liabilities and stockholders' equity	$ 103,579	$ 119,242