Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss	$ (6,416)	$ (10,532)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	3,313	3,228
Stock-based compensation expense	1,846	1,147
Provision adjustments related to doubtful accounts	111	0
Provision adjustments related to product warranty	100	105
Net gain on disposal of equipment	(1,917)	0
Other	(100)	(316)
Total non-cash adjustments	3,353	4,164
Changes in operating assets and liabilities:
Accounts receivable	(2,353)	(789)
Inventory	522	699
Other assets	(13,803)	(3,247)
Accounts payable	498	(265)
Accrued expenses and other current liabilities	10,671	2,909
Total change in operating assets and liabilities	(4,465)	(693)
Net cash used in operating activities	(7,528)	(7,061)
Cash flows from investing activities:
Purchase of equipment	(2,418)	(5,576)
Proceeds from disposal of property, plant and equipment	14,904	0
Net cash provided by (used in) investing activities	12,486	(5,576)
Cash flows from financing activities:
Net payments on credit facilities	(5,497)	0
Proceeds from exercise of equity awards	281	238
Issuance of restricted stock units	(410)	0
Taxes paid related to net share settlement of equity awards	(47)	(194)
Net cash (used in) provided by financing activities	(4,853)	44
Effect of exchange rate changes provided by foreign currency	8	35
Net increase (decrease) in cash, cash equivalents and restricted cash	113	(12,558)
Cash, cash equivalents and restricted cash at beginning of period	21,977	63,195
Cash, cash equivalents and restricted cash at end of period	22,090	50,637
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	83	56
Cash paid during the period for income taxes	59	59
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	$ (762)	$ 481