Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Revenue	$ 41,513	$ 67,243	$ 134,000
Cost of goods sold	63,434	67,283	64,365
Gross (loss) profit	(21,921)	(40)	69,635
Operating expenses:
General and administrative	8,629	9,018	11,336
Sales and marketing	1,521	1,685	1,658
Research and development	2,263	2,274	1,806
Loss on disposal of assets	550	19	84
Income (loss) from operations	(34,884)	(13,036)	54,751
Other income (expense):
Interest income	51	93	252
Interest expense	(95)
Realized (loss) gain on foreign currency translation	(583)	349	(370)
Realized gain on investments		8
Total other (expense) income	(627)	450	(118)
Income (loss) before income taxes	(35,511)	(12,586)	54,633
Income tax benefit (expense)	5,160	7,048	(16,574)
Net (loss) income	$ (30,351)	$ (5,538)	$ 38,059
Net (loss) income per common share
Basic	$ (1.35)	$ (0.25)	$ 1.67
Diluted	$ (1.35)	$ (0.25)	$ 1.61
Weighted average common shares outstanding used in computing net (loss) income per common share
Basic	22,572,212	22,523,951	22,852,205
Diluted	22,572,212	22,523,951	23,596,162