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Summary of Significant Accounting Policies - Long-Lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Long-Lived Assets
Cost	$ 80,231	$ 73,815
Accumulated Depreciation/ Amortization	$ (71,168)	(67,352)
Furniture and fixtures
Long-Lived Assets
Estimated useful lives	5 years
Cost	$ 4,244	2,809
Accumulated Depreciation/ Amortization	$ (2,463)	(2,249)
Equipment, computer hardware and purchased software | Minimum
Long-Lived Assets
Estimated useful lives	2 years
Equipment, computer hardware and purchased software | Maximum
Long-Lived Assets
Estimated useful lives	3 years
Costs of internal-use software
Long-Lived Assets
Estimated useful lives	3 years
Cost	$ 13,785	14,683
Accumulated Depreciation/ Amortization	(12,593)	(11,332)
Office equipment
Long-Lived Assets
Cost	1,672	1,012
Accumulated Depreciation/ Amortization	(982)	(894)
Computer hardware
Long-Lived Assets
Cost	12,556	11,125
Accumulated Depreciation/ Amortization	(11,273)	(10,607)
Purchased software
Long-Lived Assets
Cost	40,266	39,015
Accumulated Depreciation/ Amortization	(39,271)	(38,358)
Leasehold improvements
Long-Lived Assets
Cost	7,708	5,171
Accumulated Depreciation/ Amortization	$ (4,586)	$ (3,912)

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-1

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

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