Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net (loss) income	$ (7,460)	$ 20,568
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	3,292	3,053
Stock-based compensation expense	3,755	3,010
Provision adjustments related to credit loss	187	(35)
Provision adjustments related to product warranty	174	313
(Gain) loss on disposal of property, plant, and equipment	(1,919)	439
Other	299	(396)
Changes in operating assets and liabilities:
Accounts receivable and contract assets	7,306	(4,827)
Inventory	3,380	(7,395)
Other assets	(5,263)	(345)
Accounts payable	(4,706)	1,423
Accrued expenses and other current liabilities	6,941	(9,116)
Contract liabilities	2,650	(124)
Operating lease liabilities - current	(487)	161
Net cash provided by operating activities	8,149	6,729
Cash flows from investing activities:
Purchase of equipment	(4,743)	(3,004)
Proceeds from disposal of property, plant, and equipment	2,820	582
Acquisition of business	(2,439)	0
Net cash used in investing activities	(4,362)	(2,422)
Cash flows from financing activities:
Proceeds from employee stock purchase plan and equity awards	29	451
Proceeds from sale of common stock	0	35,937
Issuance cost associated with sale of common stock	0	(2,796)
Taxes paid related to net share settlement of equity awards	(307)	(195)
Net cash (used in) provided by financing activities	(278)	33,397
Effect of exchange rate changes provided by foreign currency	(62)	55
Net increase in cash, cash equivalents, and restricted cash	3,447	37,759
Cash, cash equivalents, and restricted cash at beginning of period	71,682	30,538
Cash, cash equivalents, and restricted cash at end of period	75,129	68,297
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	40	46
Cash paid during the period for income taxes	547	547
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	$ (76)	$ 1,026