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Balance Sheet Components - Other Accrued Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Balance Sheet Components |  |  |  |
Reserves for refunds to insurance carriers | $ 20,304 | $ 17,366 | $ 11,599 | $ 9,410
Accrued charges for third-party testing | 5,180 | 5,141 |  |
Testing and laboratory materials from suppliers | 9,247 | 2,720 |  |
Marketing and corporate affairs | 4,815 | 3,325 |  |
Legal, audit and consulting fees | 8,601 | 4,189 |  |
Accrued shipping charges | 2,475 | 1,604 |  |
Sales tax payable | 1,151 | 1,723 |  |
Accrued specimen service fees | 4,701 | 2,355 |  |
Clinical trials and studies | 1,940 | 2,353 |  |
Operating lease liabilities, current portion | 6,049 | 7,300 |  |
Fixed asset purchases | 1,803 | 1,691 |  |
Other accrued interest | 2,695 | 1,078 |  |
Deposits held for sublease | 320 |  |  |
Other accrued expenses | 8,015 | 9,562 |  |
Total other accrued liabilities | $ 77,296 | $ 60,407 |  |

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