Consolidated Statements of Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenues, net	$ 29,983	$ 49,036
Cost of revenues	17,946	22,843
Gross profit	12,037	26,193
Operating expenses:
Sales and marketing	6,958	15,836
Research and development	12,815	17,845
General and administrative	8,559	10,446
Impairment of goodwill	0	1,910
Total operating expenses	28,332	46,037
Loss from operations	(16,295)	(19,844)
Gain on divestiture (Note 7)	0	5,064
Other income, net	1,533	2,252
Loss before benefit from income taxes	(14,762)	(12,528)
Benefit from income taxes	(711)	(120)
Net loss	(14,051)	(12,408)
Foreign currency translation adjustments	1	(60)
Comprehensive loss	$ (14,050)	$ (12,468)
Net loss per share available to common stockholders, basic and diluted	$ (1.91)	$ (1.95)
Weighted-average shares used to compute net loss per share available to common stockholders, basic and diluted	7,344	6,373
Amortization of intangible assets is allocated as follows (Note 6):
Amortization of intangible assets	$ 95	$ 1,814
Restructuring related expenses are allocated as follows (Note 4):
Restructuring related expenses	1,176	497
Cost of Revenues [Member]
Stock-based compensation is allocated as follows (Note 12):
Stock-based compensation expense	251	533
Amortization of intangible assets is allocated as follows (Note 6):
Amortization of intangible assets	47	875
Restructuring related expenses are allocated as follows (Note 4):
Restructuring related expenses	529	96
Sales and Marketing [Member]
Stock-based compensation is allocated as follows (Note 12):
Stock-based compensation expense	353	681
Amortization of intangible assets is allocated as follows (Note 6):
Amortization of intangible assets	0	64
Restructuring related expenses are allocated as follows (Note 4):
Restructuring related expenses	304	401
Research and Development [Member]
Stock-based compensation is allocated as follows (Note 12):
Stock-based compensation expense	607	1,025
Amortization of intangible assets is allocated as follows (Note 6):
Amortization of intangible assets	48	875
Restructuring related expenses are allocated as follows (Note 4):
Restructuring related expenses	215	0
General and Administrative [Member]
Stock-based compensation is allocated as follows (Note 12):
Stock-based compensation expense	283	425
Amortization of intangible assets is allocated as follows (Note 6):
Amortization of intangible assets	0	0
Restructuring related expenses are allocated as follows (Note 4):
Restructuring related expenses	$ 128	$ 0