Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 21,216	$ 24,353
Restricted cash	170	183
Short-term investments	8,895	20,562
Accounts receivable, net	1,738	8,323
Inventories	21,333	22,739
Other inventory supplies	5,717	8,208
Prepaid expenses and other current assets	1,188	1,035
Total current assets	60,257	85,403
Property and equipment, net	57,569	107,676
Other assets	1,416	1,827
Total assets	119,242	194,906
Liabilities and stockholders' equity
Accounts payable	3,256	3,754
Accrued payroll	164	514
Accrued and other current liabilities	1,328	925
Corporate income and franchise taxes	207	270
Accrued real estate taxes	238	280
Short-term loan payable	1,500
Advance payments	9	10
Total current liabilities	6,702	5,753
Deferred tax liability	554	593
Total liabilities	$ 7,256	$ 6,346
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; 28,007,811 and 27,913,788 shares issued; 26,232,967 and 26,138,944 shares outstanding	$ 28	$ 28
Additional paid-in capital	373,565	372,319
Treasury stock, at cost, 1,774,844 shares	(12,148)	(12,148)
Accumulated other comprehensive loss	(33)	(43)
Accumulated deficit	(249,426)	(171,596)
Total stockholders' equity	111,986	188,560
Total liabilities and stockholders' equity	$ 119,242	$ 194,906