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Summary of Significant Accounting Policies - Long-Lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Long-Lived Assets
Cost	$ 73,815	$ 69,846
Accumulated Depreciation/ Amortization	$ (67,352)	(64,340)
Furniture and fixtures
Long-Lived Assets
Estimated useful lives	5 years
Cost	$ 2,809	2,321
Accumulated Depreciation/ Amortization	$ (2,249)	(2,143)
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	$ 14,683	12,500
Accumulated Depreciation/ Amortization	(11,332)	(10,028)
Office equipment
Long-Lived Assets
Cost	1,012	906
Accumulated Depreciation/ Amortization	(894)	(842)
Computer hardware
Long-Lived Assets
Cost	11,125	10,666
Accumulated Depreciation/ Amortization	(10,607)	(9,962)
Purchased software
Long-Lived Assets
Cost	39,015	38,466
Accumulated Depreciation/ Amortization	(38,358)	(38,046)
Leasehold improvements
Long-Lived Assets
Cost	5,171	4,987
Accumulated Depreciation/ Amortization	$ (3,912)	$ (3,319)

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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