Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 19,573	$ 4,290
Restricted cash	171	189
Short-term investments	24,361	50,528
Accounts receivable, net	10,992	30,655
Accounts receivable - related parties	1,677	1,989
Inventories	47,354	22,823
Other inventory supplies	15,813	17,613
Prepaid expenses and other current assets	2,353	4,491
Deferred tax assets	4,427	3,078
Total current assets	126,721	135,656
Property and equipment, net	119,850	120,931
Investments		2,000
Other assets	1,525	1,365
Total assets	248,096	259,952
Liabilities and stockholders' equity
Accounts payable	8,954	12,831
Accrued payroll	1,006	1,578
Accrued and other current liabilities	1,436	1,570
Corporate income and franchise taxes	216	612
Advance payments	772	9
Total current liabilities	12,384	16,600
Deferred tax liability	10,326	15,121
Total liabilities	22,710	31,721
Commitments and contingencies (Note 9)
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; 24,327,140 and 24,289,723 shares issued; 22,552,296 and 22,514,879 shares outstanding	25	24
Additional paid-in capital	334,314	332,119
Treasury stock, at cost, 1,774,844	(12,148)	(12,148)
Accumulated other comprehensive income (loss )	447	(50)
Accumulated deficit	(97,252)	(91,714)
Total stockholders' equity	225,386	228,231
Total liabilities and stockholders' equity	$ 248,096	$ 259,952