CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues, net	$ 27,188	$ 26,413
Cost of revenues	9,190	9,709
Gross profit	17,998	16,704
Operating expenses
Sales and marketing	9,107	12,157
Research and development	8,009	8,484
General and administrative	4,969	5,720
Total operating expenses	22,085	26,361
Loss from operations	(4,087)	(9,657)
Interest expense, net	(18)	(11)
Other income, net	33	244
Loss before provision for income taxes	(4,072)	(9,424)
Provision for income taxes	(341)	(236)
Net loss	(4,413)	(9,660)
Foreign currency translation adjustments	425	(977)
Comprehensive loss	$ (3,988)	$ (10,637)
Net loss per share available to common stockholders, basic and diluted	$ (0.12)	$ (0.27)
Weighted-average shares used to compute net loss per share available to common stockholders, basic and diluted	37,767	35,745
Amortization of intangible assets is allocated as follows (Note 5):
Amortization of intangible assets	$ 826	$ 646
Cost of Revenues [Member]
Stock-based compensation is allocated as follows (Note 9):
Allocation of stock-based compensation	421	229
Amortization of intangible assets is allocated as follows (Note 5):
Amortization of intangible assets	271	215
Sales and Marketing [Member]
Stock-based compensation is allocated as follows (Note 9):
Allocation of stock-based compensation	499	715
Amortization of intangible assets is allocated as follows (Note 5):
Amortization of intangible assets	248	180
Research and Development [Member]
Stock-based compensation is allocated as follows (Note 9):
Allocation of stock-based compensation	2,022	1,627
Amortization of intangible assets is allocated as follows (Note 5):
Amortization of intangible assets	271	216
General and Administrative [Member]
Stock-based compensation is allocated as follows (Note 9):
Allocation of stock-based compensation	880	924
Amortization of intangible assets is allocated as follows (Note 5):
Amortization of intangible assets	$ 36	$ 35