Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net loss	$ (5,538)	$ (82)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	1,594	1,202
Stock-based compensation expense	425	915
Provision adjustments related to doubtful accounts	0	17
Provision adjustments related to product warranty	56	58
Net loss on disposal of equipment	0	107
Other	28	(132)
Total non-cash adjustments	2,103	2,167
Changes in operating assets and liabilities:
Accounts receivable	911	(883)
Inventory	392	2,169
Other assets	(436)	(277)
Accounts payable	(2,064)	(4,322)
Accrued expenses and other current liabilities	1,763	(727)
Total change in operating assets and liabilities	566	(4,040)
Net cash used in operating activities	(2,869)	(1,955)
Cash flows from investing activities:
Purchase of equipment	(2,878)	(1,881)
Proceeds from disposal of property, plant and equipment	0	8
Net cash used in investing activities	(2,878)	(1,873)
Cash flows from financing activities:
Proceeds from stock plans	0	16
Tax withholding paid on behalf of employees for stock-based awards	(150)	(724)
Net cash used in financing activities	(150)	(708)
Effect of exchange rate changes on foreign currency	(3)	15
Net decrease in cash, cash equivalents and restricted cash	(5,900)	(4,521)
Cash, cash equivalents and restricted cash at beginning of period	63,195	68,754
Cash, cash equivalents and restricted cash at end of period	57,295	64,233
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	25	16
Cash paid during the period for income taxes	2	33
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	$ (410)	$ (176)