BALANCE SHEET INFORMATION

12 Months Ended

Mar. 31, 2022

Balance Sheet Related Disclosures [Abstract]

BALANCE SHEET INFORMATION

BALANCE SHEET INFORMATION

Certain significant amounts included in the Company's consolidated balance sheets consist of the following (in thousands):

Manufacturing inventories	March 31,
	2022		2021
Finished goods
Manufactured finished goods	$	14,395	$	12,452
Distributor inventory	212		238
Total finished goods	14,607		12,690
Work in progress	2,546		2,074
Raw materials	16,393		9,703
Total manufacturing inventories	$	33,546	$	24,467

Service inventories	March 31,
	2022		2021
Finished goods	$	19,234	$	18,773
Component parts	5,020		4,648
Total service inventories	$	24,254	$	23,421

Property and equipment, net	March 31,
	2022		2021
Machinery and equipment, and software	$	46,831	$	38,327
Leasehold improvements	6,029		7,080
Furniture and fixtures	838		847
	53,698		46,254
Less: accumulated depreciation	(40,845)		(36,203)
Total property, plant and equipment, net	$	12,853	$	10,051

Depreciation and amortization expense for property and equipment amounted to $9.4 million, $5.7 million, and $4.3 million for the years ended March 31, 2022, 2021, and 2020, respectively.

Intangibles, net	March 31, 2022						March 31, 2021
	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
Developed technology	$	9,208	$	(3,121)	$	6,087	$	4,700	$	(473)	$	4,227
Customer lists	4,600		(1,103)		3,497		900		(90)		810
Intangible assets, net	$	13,808	$	(4,224)	$	9,584	$	5,600	$	(563)	$	5,037

Intangible assets amortization expense was $3.7 million, $0.1 million for the years ended March 31, 2022 and 2021, respectively. There was no amortization expense for the year ended March 31, 2020. As of March 31, 2022, the remaining weighted-average amortization period for definite-lived intangible assets was approximately 2.4 years. The Company recorded amortization of developed technology in cost of product revenue, and customer lists in sales and marketing expenses in the consolidated statements of operations.

As of March 31, 2022, the future expected amortization expense for intangible assets is as follows (in thousands):

Fiscal year ending	Estimated future amortization expense
2023	$	4,568
2024	3,417
2025	1,599
Thereafter	—
Total	$	9,584

Goodwill	Amount
Balance at March 31, 2021	$	3,466
Goodwill acquired	9,503
Balance at March 31, 2022	$	12,969

Other accrued liabilities	March 31,
	2022		2021
Accrued expenses	$	4,984	$	6,799
Asset retirement obligation	4,590		2,906
Accrued warranty	1,899		2,383
Accrued interest	278		57
Accrued restructuring	—		580
Other	4,811		6,029
Total other accrued liabilities	$	16,562	$	18,754

The following table details the change in the accrued warranty balance (in thousands):

	Year Ended March 31,
	2022		2021		2020
Balance as of April 1	$	2,383	$	2,668	3,456
Current period accruals	3,717		4,699		3,516
Adjustments to prior estimates	(156)		(472)		(114)
Charges incurred	(4,045)		(4,512)		(4,190)
Balance as of March 31	$	1,899	$	2,383	$	2,668