Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss	$ (1,335)	$ (5,538)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	1,981	1,594
Stock-based compensation expense	801	425
Provision adjustments related to doubtful accounts	111	0
Provision adjustments related to product warranty	49	56
Net gain on disposal of equipment	(1,602)	0
Other	(259)	28
Total non-cash adjustments	1,081	2,103
Changes in operating assets and liabilities:
Accounts receivable	(1,450)	911
Inventory	(902)	392
Other assets	(2,809)	(436)
Accounts payable	794	(2,064)
Accrued expenses and other current liabilities	(1,358)	1,763
Total change in operating assets and liabilities	(5,725)	566
Net cash used in operating activities	(5,979)	(2,869)
Cash flows from investing activities:
Purchase of equipment	(1,506)	(2,878)
Proceeds from disposal of property, plant and equipment	1,947	0
Net cash provided by (used in) investing activities	441	(2,878)
Cash flows from financing activities:
Net payments on credit facilities	(1,038)	0
Taxes paid related to net share settlement of equity awards	(47)	(150)
Net cash used in financing activities	(1,085)	(150)
Effect of exchange rate changes provided by foreign currency	32	(3)
Net decrease in cash, cash equivalents and restricted cash	(6,591)	(5,900)
Cash, cash equivalents and restricted cash at beginning of period	21,977	63,195
Cash, cash equivalents and restricted cash at end of period	15,386	57,295
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	47	25
Cash paid during the period for income taxes	0	2
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	$ (725)	$ (410)