Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 21,290	$ 21,216
Restricted cash	186	170
Short-term investments	3,115	8,895
Accounts receivable, net	1,938	1,738
Inventories	20,853	21,333
Other inventory supplies	5,502	5,717
Prepaid expenses and other current assets	806	1,188
Total current assets	53,690	60,257
Property and equipment, net	56,476	57,569
Other assets	1,171	1,416
Total assets	111,337	119,242
Liabilities and stockholders' equity
Accounts payable	3,474	3,256
Accrued payroll	236	164
Accrued and other current liabilities	336	1,328
Corporate income and franchise taxes	59	207
Accrued real estate taxes	296	238
Short-term loan payable	1,500	1,500
Advance payments	16	9
Total current liabilities	5,917	6,702
Deferred tax liability	395	554
Total liabilities	$ 6,312	$ 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 28,497,802 and 28,007,811 shares issued; 26,722,958 and 26,232,967 shares outstanding	$ 29	$ 28
Additional paid-in capital	373,933	373,565
Treasury stock, at cost, 1,774,844 shares	(12,148)	(12,148)
Accumulated other comprehensive loss	(30)	(33)
Accumulated deficit	(256,759)	(249,426)
Total stockholders' equity	105,025	111,986
Total liabilities and stockholders' equity	$ 111,337	$ 119,242