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Commitments and Contingencies - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2019 | Apr. 30, 2018
Commitments and Contingencies [Line Items] |  |
Operating leases, rent expense | $ 822,000 | $ 657,000
Corporate Headquarters |  |
Commitments and Contingencies [Line Items] |  |
Operating leases, rent expense | 91,000 | 90,000
Laboratories and Office Space |  |
Commitments and Contingencies [Line Items] |  |
Operating leases, rent expense | 0 | 59,000
New York Laboratory |  |
Commitments and Contingencies [Line Items] |  |
Operating leases, rent expense | 0 | 52,000
Rockville, MD |  |
Commitments and Contingencies [Line Items] |  |
Operating leases, rent expense | 604,000 | 454,000
Gaithersburg, MD |  |
Commitments and Contingencies [Line Items] |  |
Operating leases, rent expense | 41,000 | 0
Rockville, MD New Location |  |
Commitments and Contingencies [Line Items] |  |
Operating leases, rent expense | 86,000 | $ 0
Minimum |  |
Commitments and Contingencies [Line Items] |  |
Royalty fee per tumor sample | $ 0 |
Royalty payment, as percent of contract price | 2.00% |
Maximum |  |
Commitments and Contingencies [Line Items] |  |
Royalty fee per tumor sample | $ 7,000 |
Royalty payment, as percent of contract price | 5.00% |

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- Definition Collaboration Arrangement Royalty Fee + References No definition available. + Details
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- Definition Collaboration Arrangement, Royalty Fee, Percent Of Contract Price + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Details
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- Details
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- Details
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