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Balance Sheet Components - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 18,487	$ 19,374
Less accumulated depreciation and amortization	(17,828)	(18,027)
Total	659	1,347
Depreciation expense	710	884
Capitalized computer software, amortization	2	106
Office equipment and office furniture
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,838	8,071
Capitalized internal-use software and website development
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,390	4,390
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,117	4,126
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,142	$ 2,787

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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