Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 21,506	$ 19,573
Restricted cash	171	171
Short-term investments	14,339	24,361
Accounts receivable, net	8,900	10,992
Accounts receivable, related parties	630	1,677
Inventories	49,535	47,354
Other inventory supplies	14,674	15,813
Prepaid expenses and other current assets	1,228	2,353
Deferred tax assets	4,833	4,427
Total current assets	115,816	126,721
Property and equipment, net	116,932	119,850
Other assets	1,204	1,525
Total assets	233,952	248,096
Liabilities and stockholders' equity
Accounts payable	2,312	8,954
Accrued payroll	428	1,006
Accrued and other current liabilities	1,329	1,436
Corporate income and franchise taxes	90	216
Advance payments	701	772
Total current liabilities	4,860	12,384
Deferred tax liability	7,278	10,326
Total liabilities	12,138	22,710
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, 45,000,000 shares authorized, 24,354,297 and 24,327,140 shares issued; 22,579,453 and 22,552,296 shares outstanding	25	25
Additional paid-in capital	334,843	334,314
Treasury stock, at cost, 1,774,844 shares	(12,148)	(12,148)
Accumulated other comprehensive income (loss)	(157)	447
Accumulated deficit	(100,749)	(97,252)
Total stockholders' equity	221,814	225,386
Total liabilities and stockholders' equity	$ 233,952	$ 248,096