Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net loss	$ (21,009)	$ (11,567)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	5,011	4,102
Stock-based compensation expense	1,824	2,713
Provision adjustments related to doubtful accounts	62	599
Provision adjustments related to product warranty	139	336
Net loss on disposal of equipment	0	39
Other	(72)	100
Total non-cash adjustments	6,964	7,889
Changes in operating assets and liabilities, net of acquired assets and assumed liabilities:
Accounts receivable	5,119	6,796
Inventory	(1,211)	1,777
Other assets	(3,899)	(3,192)
Accounts payable	(4,508)	(1,662)
Accrued expenses and other current liabilities	6,835	1,199
Total change in operating assets and liabilities	2,336	4,918
Net cash (used in) provided by operating activities	(11,709)	1,240
Cash flows from investing activities:
Purchase of equipment	(8,615)	(3,756)
Acquisition of business, net of cash acquired	(22,246)	0
Proceeds from disposal of property, plant and equipment	0	77
Net cash used in investing activities	(30,861)	(3,679)
Cash flows from financing activities:
Proceeds from exercise of equity awards	238	445
Taxes paid related to net share settlement of equity awards	(203)	(1,257)
Net cash provided by (used in) financing activities	35	(812)
Effect of exchange rate changes provided by foreign currency	1	2
Net decrease in cash, cash equivalents and restricted cash	(42,534)	(3,249)
Cash, cash equivalents and restricted cash at beginning of period	63,195	68,754
Cash, cash equivalents and restricted cash at end of period	20,661	65,505
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	96	47
Cash paid during the period for income taxes	59	130
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	$ (338)	$ 1,291