Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues, net	$ 13,448	$ 15,402
Cost of revenues	5,811	7,572
Gross profit	7,637	7,830
Operating expenses
Sales and marketing	4,634	7,381
Research and development	4,895	6,155
General and administrative	3,221	3,377
Total operating expenses	12,750	16,913
Loss from operations	(5,113)	(9,083)
Other income, net	540	295
Loss before provision for income taxes	(4,573)	(8,788)
Provision for income taxes	33	324
Net loss	(4,606)	(9,112)
Foreign currency translation adjustments	(71)	444
Comprehensive loss	$ (4,677)	$ (8,668)
Net loss per share available to common stockholders, basic and diluted (Note 12) (in dollars per share)	$ (0.77)	$ (1.59)
Weighted-average shares used to compute net loss per share available to common stockholders, basic and diluted (in shares)	5,945	5,736
Amortization of intangible assets	$ 532	$ 690
Cost of Sales [Member]
Operating expenses
Allocated Share-based Compensation Expense	125	204
Amortization of intangible assets	234	237
Restructuring Costs	6	139
Selling and Marketing Expense [Member]
Operating expenses
Allocated Share-based Compensation Expense	180	240
Amortization of intangible assets	64	213
Restructuring Costs	157	497
Research and Development Expense [Member]
Operating expenses
Allocated Share-based Compensation Expense	281	339
Amortization of intangible assets	234	237
Restructuring Costs		115
General and Administrative Expense [Member]
Operating expenses
Allocated Share-based Compensation Expense	99	245
Amortization of intangible assets		3
Restructuring Costs		$ 111