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Income Taxes - Significant Components 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: |  |  |  |
Net operating loss carryforwards | $ 91,034 | $ 64,648 |  |
Tax credit carryforwards | 7,110 | 5,601 |  |
Share-based compensation | 8,831 | 5,932 |  |
Allowances and other | 14,996 | 11,443 |  |
Lease obligation | 22,624 | 23,869 |  |
Total deferred tax assets | 144,595 | 111,493 |  |
Valuation allowance | (123,803) | (88,433) | $ (66,435) | $ (44,321)
Net deferred tax assets | 20,792 | 23,060 |  |
Deferred Tax Liabilities: |  |  |  |
Depreciation and Amortization | 108 | 850 |  |
Right of use asset | 20,634 | 22,171 |  |
Total deferred tax liability | 20,742 | 23,021 |  |
Total deferred tax assets | $ 50 | $ 39 |  |

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