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Supplemental Financial Information
 12 Months Ended
Apr. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Financial Information Supplemental Financial Information
Inventories
Inventories consisted of the following (in thousands):
April 30, 2022April 30, 2021
Raw materials$11,610 $2,177 
Work in process10,352 1,844 
Finished goods5,375 3,083 
$27,337 $7,104 
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
April 30, 2022April 30, 2021
Prepaid expenses$4,477 $1,313 
Advances to suppliers188 6,276 
Other current assets1,258 1,142 
$5,923 $8,731 
Property and Equipment, Net
Property and equipment consisted of the following (in thousands):
April 30, 2022April 30, 2021
Computer equipment and software$1,736 $1,606 
Laboratory equipment9,521 6,603 
Production equipment15,502 5,680 
Leasehold improvements1,465 1,349 
Others524 439 
Construction in progress2,932 4,698 
$31,680 $20,375 
Less: accumulated depreciation and amortization(9,836)(6,144)
$21,844 $14,231 
Depreciation and amortization expense, excluding the assets impairment charges, for the years ended April 30, 2022, 2021 and 2020, was $4.8 million, $2.2 million, and $1.8 million, respectively. Construction in progress and production equipment primarily includes mask set costs capitalized relating to the Company’s new products to be introduced or yet to be in production.
Other Non-current Assets
Other non-current assets consisted of the following (in thousands):
April 30, 2022April 30, 2021
Non-current contract assets$983 $1,819 
Other non-current assets3,731 1,641 
$4,714 $3,460 
Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities consisted of the following (in thousands):
April 30, 2022April 30, 2021
Accrued expenses$8,372 $2,652 
Current portion of operating lease liabilities2,379 — 
Income tax payable1,312 625 
$12,063 $3,277