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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred Tax Assets |  |
Start-up and organizational costs | $ 103 | $ 117
Goodwill | 18,774 | 23,778
Operating lease liabilities | 15,968 | 15,963
Accrued expenses | 10,345 | 7,434
Stock based compensation | 8,714 | 8,530
Net operating loss carryforwards | 130,242 | 123,604
Federal and state research tax credits | 1,828 | 1,828
Fixed assets | 480 | 131
Interest deduction limitation | 7,795 | 2,452
Outside basis differences | 1,972 | 197
Other | 9,236 | 8,428
Subtotal | 205,457 | 192,462
Valuation allowance | (101,345) | (89,723)
Total deferred tax assets | 104,112 | 102,739
Deferred Tax Liabilities |  |
Internally developed software costs | 12,501 | 12,973
Intangible assets | 48,677 | 49,053
Right-of-use assets - Operating | 12,284 | 13,122
Contract fulfillment costs | 8,317 | 6,375
Convertible debt | 17,604 | 20,411
Other | 5,387 | 1,484
Total deferred tax liabilities | 104,770 | 103,418
Net deferred tax assets (liabilities) | $ (658) | $ (679)

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