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Commitment and Contingencies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) leaseExtention | Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |
Rent expense | $ 500,000 | $ 400,000
Minimum annual purchase commitment | $ 3,250,000 |
Purchase commitment, term | 3 years |
Minimum | Licensing Agreements |  |
Loss Contingencies [Line Items] |  |
Royalty obligation, percent of net sales | 3.00% |
Maximum |  |
Loss Contingencies [Line Items] |  |
Royalty obligation, percent of net sales | 20.00% |
Prometheus Laboratories |  |
Loss Contingencies [Line Items] |  |
Remaining milestone obligation | $ 2,000,000.0 |
Remaining milestone obligation, fair value | 0 | $ 0
Advance royalties payment | $ 100,000 |
Prometheus Laboratories | Minimum |  |
Loss Contingencies [Line Items] |  |
Royalty obligation, percent of net sales | 2.50% |
Prometheus Laboratories | Maximum |  |
Loss Contingencies [Line Items] |  |
Royalty obligation, percent of net sales | 7.50% |
Future minimum royalty commitment | $ 4,200,000 |
Office and Laboratory |  |
Loss Contingencies [Line Items] |  |
Number of operating lease extensions | leaseExtention | 2 |
Operating lease, renewal term | 36 months |
Office |  |
Loss Contingencies [Line Items] |  |
Operating lease, renewal term | 24 months |

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