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Income Taxes - Reconciliation of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ 15,287 | $ 18,937 |
Research and development tax credits | 419 | 313 |
Accruals, reserves and other | 590 | 1,394 |
Interest expense | 744 | 691 |
Basis differences in fixed and intangible assets | 225 | 230 |
Total gross deferred tax assets | 17,265 | 21,565 |
Less: Valuation allowance | (16,797) | (21,138) | $ (19,929)
Deferred tax assets, net | 468 | 427 |
Deferred tax liabilities: |  |  |
Financing and acquisition-related liabilities | (336) | (338) |
Indefinite lived assets | (396) | (334) |
Deferred tax liabilities, net | (732) | (672) |
Net deferred tax liabilities | $ (264) | $ (245) |

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