Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Net sales	$ 137,831	$ 114,753	$ 90,028
Cost of products sold and services delivered	51,988	47,038	41,753
Excess inventory charges			3,746
Gross margin	85,843	67,715	44,529
Operating expenses:
Sales, general and administrative	46,584	39,086	38,001
Research and development	9,888	8,139	9,989
Litigation judgments (recoveries)	1,450	(2,200)	3,301
Loss on impairment			1,354
(Gain) loss on write down / disposal of property and equipment, net	(27)	161	2,800
Total operating expenses	57,895	45,186	55,445
Income (loss) from operations	27,948	22,529	(10,916)
Interest and other income, net	86	83	1,287
Income (loss) before provision (benefit) for income taxes	28,034	22,612	(9,629)
Provision (benefit) for income taxes	9,790	7,874	(2,589)
Net income (loss)	18,244	14,738	(7,040)
Net income (loss) per common and common equivalent shares:
Basic	$ 0.35	$ 0.27	$ (0.12)
Diluted	$ 0.34	$ 0.27	$ (0.12)
Weighted average number of common and common equivalent shares outstanding:
Basic	51,880	53,827	59,436
Diluted	54,152	54,723	59,436
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	18,244	14,738	(7,040)
Foreign currency translation adjustments	55	24	(45)
Comprehensive income (loss)	$ 18,299	$ 14,762	$ (7,085)