Consolidated Statements Of Operations and Comprehensive Loss (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
NET REVENUE	$ 217,665	$ 206,565	$ 194,548
COST OF GOODS SOLD	145,090	140,495	146,177
GROSS PROFIT	72,575	66,070	48,371
OPERATING EXPENSES:
Research and development	37,645	35,332	34,199
Sales and marketing	14,505	13,450	14,133
General and administrative	12,122	11,658	9,695
Total operating expenses	64,272	60,440	58,027
OPERATING INCOME (LOSS)	8,303	5,630	(9,656)
OTHER INCOME:
Interest income (expense), net	(36)	(16)	(8)
Other income (expense), net	15	(23)	11
Total other income (expense), net	(21)	(39)	3
INCOME (LOSS) BEFORE INCOME TAXES AND DISCONTINUED OPERATIONS	8,282	5,591	(9,653)
INCOME TAX EXPENSE	227	51	749
INCOME (LOSS) FROM CONTINUING OPERATIONS	8,055	5,540	(10,402)
LOSS FROM DISCONTINUED OPERATIONS	0	(476)	(4,548)
NET INCOME (LOSS)	8,055	5,064	(14,950)
NET INCOME (LOSS) PER SHARE
Income (Loss) from continuing operations - basic and diluted	$ 0.13	$ 0.09	$ (0.18)
Loss from discontinued operations - basic and diluted	$ 0.00	$ (0.01)	$ (0.08)
Net Income (Loss) per share - basic and diluted	$ 0.13	$ 0.09	$ (0.26)
WEIGHTED AVERAGE SHARES USED TO CALCULATE NET LOSS PER SHARE:
Basic weighted-average common shares outstanding	60,171	58,521	56,954
Diluted weighted-average common shares outstanding	63,898	59,247	56,954
COMPREHENSIVE INCOME (LOSS):
NET INCOME (LOSS)	8,055	5,064	(14,950)
Foreign currency translation adjustment	102	279	129
Comprehensive income (loss)	$ 8,157	$ 5,343	$ (14,821)