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Property, plant and equipment, net
 6 Months Ended
Sep. 30, 2022
Property, Plant and Equipment [Abstract]  
Property, plant and equipment, net Property, plant and equipment, net
Property, plant and equipment, net consisted of the following:
September 30, 2022March 31, 2022
Office equipment$995 $937 
Computer equipment1,893 1,667 
Plant and laboratory equipment8,285 7,720 
Leasehold improvements1,696 785 
Construction in progress1,073 1,619 
     Total property, plant and equipment13,942 12,728 
Less: Accumulated depreciation(6,032)(4,795)
     Property, plant and equipment, net$7,910 $7,933 
Depreciation expense was $617 and $1,237 for the three and six months ended September 30, 2022 and $532 and $1,050 for the three and six months ended September 30, 2021, respectively. Depreciation expense is recorded within research and development and selling, general and administrative expenses in the consolidated statement of operations.