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Commitment and Contingencies - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |  |
Rent expense | $ 100,000 | $ 100,000 |  |
Minimum annual purchase commitment |  |  | $ 4,200,000 |
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] |  |  |  |
Operating lease, renewal term | 5 years |  |  |
Office |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating lease, renewal term | 5 years |  |  |

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