Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (7,000)	$ (35,984)	$ (17,453)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	5,484	7,142	5,617
Stock-based compensation expense	3,517	2,607	3,648
Provision adjustments related to doubtful accounts	188	62	599
Provision adjustments related to product warranty	373	186	431
Net (gain) loss on disposal of property, plant and equipment	(2,284)	(302)	34
Other	(342)	464	412
Total non-cash adjustments	6,936	10,159	10,741
Changes in operating assets and liabilities:
Accounts receivable and contract assets	(7,518)	3,980	2,372
Inventory	(1,226)	6,486	5,067
Other assets	(13,465)	(238)	784
Accounts payable	6,171	(4,539)	477
Accrued expenses and other current liabilities	12,210	4,985	(518)
Total change in operating assets and liabilities	(3,828)	10,674	8,182
Net cash used in operating activities	(3,892)	(15,151)	1,470
Cash flows from investing activities:
Purchase of equipment	(4,516)	(10,790)	(6,583)
Acquisition of business, net of cash acquired		(21,483)
Proceeds from disposal of property, plant and equipment	15,403	470	82
Net cash provided by (used in) investing activities	10,887	(31,803)	(6,501)
Cash flows from financing activities:
Proceeds from PPP loan	6,488
Net (payments) proceeds from borrowings of credit facilities	(5,497)	5,497
Proceeds from exercise of equity awards	619	505	770
Taxes paid related to net share settlement of equity awards	(111)	(203)	(1,257)
Net cash provided by financing activities	1,499	5,799	(487)
Effect of exchange rate changes provided by foreign currency	67	(63)	(41)
Net increase (decrease) in cash, cash equivalents and restricted cash	8,561	(41,218)	(5,559)
Cash, cash equivalents and restricted cash at beginning of period	21,977	63,195	68,754
Cash, cash equivalents and restricted cash at end of period	30,538	21,977	63,195
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	113	126	63
Cash paid during the period for income taxes	63	68	131
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	(520)	$ (180)	$ 755
Restricted stock units issued in settlement of bonus	$ 410