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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 28,393 | $ 21,134
Tax credit carryforwards | 2,801 | 9,022
Accrued expenses | 12,548 | 17,393
Allowance for bad debt | 2,116 | 3,757
Share-based compensation expense | 3,545 | 5,923
Impairment of investments | 0 | 6,714
Deferred revenue | 4,331 | 912
State taxes | 3,771 | 4,948
Other | 9,426 | 11,071
Deferred tax assets, gross | 66,931 | 80,874
Less: valuation allowance | (1,812) | (8,262)
Total deferred tax assets | 65,119 | 72,612
Deferred tax liabilities: |  |
Basis difference in property and equipment | (8,337) | (17,126)
Basis difference in intangible assets | (117,244) | (129,301)
Unrealized gains on investments | (11,291) | 0
Prepaid insurance | (3,121) | (2,703)
Convertible debt | (21,972) | (65,192)
Other | (6,219) | (3,403)
Total deferred tax liabilities | (168,184) | (217,725)
Net deferred tax liabilities | $ (103,065) | $ (145,113)

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