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v3.20.4

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Allowance for doubtful accounts | $ 1,816 | $ 2,140 |  |
Inventory | 289 | 415 |  |
Equity securities and investments in affiliates | 570 | 11,933 |  |
Property, plant and equipment | 1,882 | 1,830 |  |
Intangible assets | 74,981 | 85,308 |  |
Accrued liabilities | 1,834 | 3,385 |  |
Lease liabilities | 6,140 | 10,035 |  |
Stock-based compensation | 16,402 | 19,389 |  |
Deferred revenue | 7,423 | 14,876 |  |
Research and development tax credits | 10,210 | 9,686 |  |
Investments in subsidiaries included in discontinued operations | 0 | 8,592 |  |
Net operating, capital loss, and interest expense carryforwards | 275,519 | 196,663 |  |
Total deferred tax assets | 397,066 | 364,252 |  |
Less: Valuation allowance | 387,348 | 349,008 | $ 292,217 | $ 211,078
Net deferred tax assets | 9,718 | 15,244 |  |
Deferred tax liabilities |  |  |  |
Right-of-use assets | 5,011 | 8,091 |  |
Long-term debt | 7,604 | 9,987 |  |
Total deferred tax liabilities | 12,615 | 18,078 |  |
Net deferred tax liabilities included in continuing operations | $ (2,897) | $ (2,834) |  |

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