Consolidated balance sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 24,730	$ 21,071
Restricted cash	197	165
Short-term investments	33,260	13,567
Accounts receivable, net	8,389	3,571
Accounts receivable, related parties	145
Inventories	23,364	34,312
Other inventory supplies	11,420	12,533
Prepaid expenses and other current assets	1,010	1,186
Total current assets	102,515	86,405
Property and equipment, net	112,860	115,220
Other assets	1,771	1,070
Total assets	217,146	202,695
Liabilities and stockholders' equity
Accounts payable	4,388	4,465
Accrued payroll	423	369
Accrued and other current liabilities	850	867
Corporate income and franchise taxes	132	192
Accrued real estate taxes	325	336
Advance payments	107	408
Total current liabilities	6,225	6,637
Deferred tax liability	225	267
Total liabilities	6,450	6,904
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.001 par value, 5,000,000 undesignated shares authorized, no shares issued or outstanding	0	0
Common stock, $0.001 par value, 40,000,000 shares authorized and 27,931,601 and 24,453,523 shares issued; 26,156,757 and 22,658,679 shares outstanding	28	25
Additional paid-in capital	371,777	335,935
Treasury stock, at cost, 1,774,844 shares	(12,148)	(12,148)
Accumulated other comprehensive loss	(480)	(418)
Accumulated deficit	(148,481)	(127,603)
Total stockholders' equity	210,696	195,791
Total liabilities and stockholders' equity	$ 217,146	$ 202,695