Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Operations [Abstract]
Revenue	$ 67,243	$ 134,000	$ 77,362
Cost of goods sold	67,283	64,365	36,205
Gross profit (loss)	(40)	69,635	41,157
Operating expenses:
General and administrative	9,018	11,336	9,883
Sales and marketing	1,685	1,658	1,267
Research and development	2,274	1,806	1,079
Loss on disposal of assets	19	84	234
Income (loss) from operations	(13,036)	54,751	28,694
Other income (expense):
Interest income	93	252	358
Realized gain (loss) on foreign currency translation	349	(370)	(20)
Realized gain on investments	8		8
Total other income (expense)	450	(118)	346
Income (loss) before income taxes	(12,586)	54,633	29,040
Income tax benefit (expense)	7,048	(16,574)	71
Net income (loss)	$ (5,538)	$ 38,059	$ 29,111
Net income (loss) per common share
Basic	$ (0.25)	$ 1.67	$ 1.34
Diluted	$ (0.25)	$ 1.61	$ 1.28
Weighted average common shares outstanding used in computing net income (loss) per common share
Basic	22,523,951	22,852,205	21,726,090
Diluted	22,523,951	23,596,162	22,790,896