Consolidated balance sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 25,144	$ 21,071
Restricted cash	195	165
Short-term investments	27,828	13,567
Accounts receivable	5,367	3,571
Accounts receivable, related parties	455
Inventories	23,060	34,312
Other inventory supplies	9,150	12,533
Prepaid expenses and other current assets	586	1,186
Total current assets	91,785	86,405
Property and equipment, net	110,347	115,220
Other assets	1,973	1,070
Total assets	204,105	202,695
Liabilities and stockholders' equity
Accounts payable	4,058	4,465
Accrued payroll	626	369
Accrued and other current liabilities	875	867
Corporate income and franchise taxes	198	192
Accrued real estate taxes	266	336
Advance payments	5	408
Total current liabilities	6,028	6,637
Deferred tax liability	267	267
Total liabilities	6,295	6,904
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 27,926,575 and 24,433,523 shares issued; 26,151,731 and 22,658,679 shares outstanding	28	25
Additional paid-in capital	372,004	335,935
Treasury stock, at cost, 1,774,844 shares	(12,148)	(12,148)
Accumulated other comprehensive income (loss)	120	(418)
Accumulated deficit	(162,194)	(127,603)
Total stockholders' equity	197,810	195,791
Total liabilities and stockholders' equity	$ 204,105	$ 202,695