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Commitment and Contingencies - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 11, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |  |  |
Operating lease, rent expense |  | $ 200,000 | $ 100,000 |
Purchase obligation, to be paid remainder of fiscal year |  | 4,100,000 |  |
Purchase obligation, due in year one |  | $ 6,000,000.0 |  |
Annual increase in purchase commitments |  | 15.00% |  |
Licensing Agreements | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Initial license fee | $ 400,000 |  |  |
Minimum | Licensing Agreements |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Royalty obligation, percent of net sales |  | 2.00% |  |
Maximum | Licensing Agreements |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Royalty obligation, percent of net sales |  | 3.00% |  |
Prometheus Laboratories |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Remaining milestone obligation |  | $ 2,000,000.0 |  | $ 2,000,000.0
Remaining milestone obligation, fair value |  | 0 |  | $ 0
Future minimum royalty commitment |  | 1,200,000 |  |
Advance royalties payment |  | $ 100,000 |  |
Prometheus Laboratories | Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Royalty obligation, percent of net sales |  | 2.50% |  |
Allegheny Health Network Research Institute | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Collaboration fee | $ 400,000 |  |  |
Office and Laboratory |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating lease, renewal term |  | 5 years |  |
Office |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating lease, renewal term |  | 5 years |  |

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