Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 21,428	$ 24,353
Restricted cash	167	183
Short-term investments	12,676	20,562
Accounts receivable, net	3,276	8,323
Inventories	23,112	22,739
Other inventory supplies	6,660	8,208
Prepaid expenses and other current assets	1,063	1,035
Total current assets	68,382	85,403
Property and equipment, net	59,079	107,676
Other assets	1,492	1,827
Total assets	128,953	194,906
Liabilities and stockholders' equity
Accounts payable	2,563	3,754
Accrued payroll	192	514
Accrued and other current liabilities	1,381	925
Corporate income and franchise taxes	200	270
Accrued real estate taxes	183	280
Advance payments	37	10
Total current liabilities	4,556	5,753
Deferred tax liability	9	593
Total liabilities	$ 4,565	$ 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 and 27,978,379 and 27,913,788 shares issued; 26,203,535 and 26,138,944 shares outstanding	$ 28	$ 28
Additional paid-in capital	373,255	372,319
Treasury stock, at cost, 1,774,844 shares	(12,148)	(12,148)
Accumulated other comprehensive loss	(27)	(43)
Accumulated deficit	(236,720)	(171,596)
Total stockholders' equity	124,388	188,560
Total liabilities and stockholders' equity	$ 128,953	$ 194,906