CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net (loss) income	$ (23,921)	$ 189
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization expense	3,661	2,037
Stock-based compensation expense	3,269	2,232
Provision adjustments related to credit loss	59	165
Provision adjustments related to product warranty	9	139
(Gain) on disposal of property, plant, and equipment	(1,147)	(601)
Other	(158)	464
Total non-cash adjustments	5,693	4,436
Changes in operating assets and liabilities:
Accounts receivable and contract assets	(7,419)	4,351
Inventory	(2,980)	6,663
Other assets	(2,770)	(4,857)
Accounts payable	1,782	(4,893)
Contract liabilities	(1,052)	888
Operating lease liabilities - current	434	(260)
Accrued expenses and other liabilities	7,423	5,018
Total change in operating assets and liabilities	(4,582)	6,910
Net cash provided by operating activities	(22,810)	11,535
Cash flows from investing activities:
Purchase of equipment	(1,531)	(3,297)
Proceeds from disposal of property, plant, and equipment	10,915	1,128
Acquisition of business, net of cash acquired	96	0
Net cash used in investing activities	9,480	(2,169)
Cash flows from financing activities:
Proceeds from borrowings of credit facilities	392	0
Payments towards credit facilities	(3,865)	0
Proceeds from sale of common stock	15,628	0
Proceeds from employee stock purchase plans and exercise of equity awards	0	29
Taxes paid related to net share settlement of equity awards	(143)	(156)
Net cash (used in) provided by financing activities	12,012	(127)
Effect of exchange rate changes provided by foreign currency	16	28
Net (decrease) increase in cash, cash equivalents, and restricted cash	(1,302)	9,267
Cash, cash equivalents, and restricted cash at beginning of period	26,145	71,682
Cash, cash equivalents, and restricted cash at end of period	24,843	80,949
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	639	30
Cash paid during the period for income taxes	64	361
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	$ (373)	$ (11)