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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)

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