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Revenue from Contracts with Customers
 6 Months Ended
Oct. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers Revenue from Contracts with Customers
Oncology Services Revenue
The following tables represents disaggregated revenue for the three and six months ended October 31, 2022 and 2021:
Three Months Ended
October 31,		Six Months Ended October 31,
 2022202120222021
Pharmacology services$13,480 $11,143 $26,236 $21,846 
Other TOS revenue731 643 1,679 1,169 
Personalized oncology services70 — 111 24 
Total oncology services revenue$14,281 $11,786 $28,026 $23,039 
Other TOS revenue represents additional services provided to the Company's pharmaceutical and biotechnology customers, specifically flow cytometry services and software-as-a-service ("SaaS") provided via our Lumin Bioinformatics software ("Lumin").

Contract Balances
Contract assets include unbilled amounts typically resulting from revenue recognized in excess of the amounts billed to the customer for which the right to payment is subject to factors other than the passage of time. These amounts may not exceed their net realizable value. Contract assets are classified as current and included in accounts receivable. Contract liabilities consist of customer payments received in advance of performance and billings in excess of revenue recognized, net of revenue recognized from the balance at the beginning of the period and included in deferred revenue. Contract assets and liabilities are presented on the balance sheet on a net contract-by-contract basis at the end of each reporting period.