Condensed Consolidated Statements of Comprehensive Loss (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues, net	$ 22,815	$ 17,155
Cost of revenues	8,383	7,372
Gross profit	14,432	9,783
Operating expenses
Sales and marketing	11,989	10,459
Research and development	6,083	5,079
General and administrative	4,416	4,048
Total operating expenses	22,488	19,586
Loss from operations	(8,056)	(9,803)
Interest expense, net	(66)	(184)
Other income (expenses), net	4	(408)
Loss before provision for income taxes	(8,118)	(10,395)
Provision for income taxes	(188)	(106)
Net loss	(8,306)	(10,501)
Foreign currency translation adjustments	129
Comprehensive loss	(8,177)	(10,501)
Net loss per share available to common stockholders, basic and diluted	$ (0.25)	$ (1.43)
Weighted-average shares used to compute net loss per share available to common stockholders, basic and diluted	33,112	7,365
Cost of Revenues [Member]
Stock-based compensation is allocated as follows (Note 7):
Allocation of stock-based compensation	211	205
Sales and Marketing [Member]
Stock-based compensation is allocated as follows (Note 7):
Allocation of stock-based compensation	403	293
Research and Development [Member]
Stock-based compensation is allocated as follows (Note 7):
Allocation of stock-based compensation	437	308
General and Administrative [Member]
Stock-based compensation is allocated as follows (Note 7):
Allocation of stock-based compensation	$ 446	$ 419