Consolidated Statements Of Operations (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements Of Operations [Abstract]
Revenue , net	$ 33,637	$ 20,522	$ 114,635	$ 47,825
Cost of goods sold	17,516	9,423	47,339	25,348
Gross profit	16,121	11,099	67,296	22,477
Operating expenses:
General and administrative	3,251	2,341	9,228	6,918
Sales and marketing	519	329	1,284	892
Research and development	466	260	1,303	706
Loss on disposal of assets		29	7	334
Income from operations	11,885	8,140	55,474	13,627
Other income:
Interest income	56	43	207	196
Realized loss on foreign currency translation	(166)	(13)	(172)	(72)
Realized gain on investments				8
Total other (expense) income	(110)	30	35	132
Income before income taxes	11,775	8,170	55,509	13,759
Income tax (expense) benefit	(3,589)	126	(18,311)
Net income	$ 8,186	$ 8,296	$ 37,198	$ 13,759
Net income per common share
Basic	$ 0.36	$ 0.36	$ 1.62	$ 0.65
Diluted	$ 0.35	$ 0.35	$ 1.57	$ 0.61
Weighted average common shares outstanding used in computing net income per common share
Basic	22,822,286	22,923,900	22,948,980	21,319,485
Diluted	23,410,525	23,977,278	23,760,859	22,442,553