CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenue	$ 47,654	$ 37,260	$ 86,477	$ 72,626
Cost of goods sold	16,633	13,378	29,660	25,656
Gross profit	31,021	23,882	56,817	46,970
Operating costs:
Sales and marketing	11,310	10,470	21,681	20,101
Research and development	5,202	5,345	10,343	10,192
General and administrative	5,734	5,492	11,007	10,944
Amortization of purchased intangible assets	1,129	651	2,249	1,093
Total operating costs	23,375	21,958	45,280	42,330
Operating income	7,646	1,924	11,537	4,640
Interest income, net	10	40	34	82
Other income, net	249	265	687	413
Income from continuing operations before income taxes	7,905	2,229	12,258	5,135
Provision for income taxes	1,012	379	1,839	873
Net income from continuing operations	6,893	1,850	10,419	4,262
Income (loss) from discontinued operations	(7)	(41)	(22)	333
Net income	$ 6,886	$ 1,809	$ 10,397	$ 4,595
Basic income (loss) per share
Continuing	$ 0.18	$ 0.05	$ 0.26	$ 0.11
Discontinued	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Total	$ 0.18	$ 0.05	$ 0.26	$ 0.12
Diluted income (loss) per share
Continuing	$ 0.17	$ 0.05	$ 0.26	$ 0.11
Discontinued	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Total	$ 0.17	$ 0.05	$ 0.26	$ 0.12
Weighted average common shares outstanding:
Basic	39,358	38,908	39,315	38,798
Diluted	39,471	39,226	39,430	39,145