Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 6,030	$ 6,270
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion expense	2,646	1,696
Stock-based compensation expense	2,672	1,629
Provision adjustments related to doubtful accounts	7	20
Provision adjustments related to product warranty	488	302
Impairments	468	0
Recognition of previously deferred gain on sale of assets from discontinued operations	0	(3,804)
Net gain on disposal of equipment	(322)	(41)
Other	321	(1,422)
Total non-cash adjustments	6,280	(1,620)
Changes in operating assets and liabilities:
Accounts receivable	(3,878)	(4,358)
Inventory	(1,782)	(6,420)
Other assets	(2,627)	120
Accounts payable	2,951	2,884
Accrued expenses and other current liabilities	834	(1,118)
Total change in operating assets and liabilities	(4,502)	(8,892)
Net cash provided by (used in) operating activities	7,808	(4,242)
Cash flows from investing activities:
Purchase of equipment	(7,262)	(4,480)
Receipt of escrow funds from sale of assets	0	1,853
Proceeds from disposal of property, plant and equipment	339	50
Net cash used in investing activities	(6,923)	(2,577)
Cash flows from financing activities:
Proceeds from stock plans	797	614
Net cash provided by financing activities	797	614
Effect of exchange rate changes on foreign currency	(35)	210
Net increase (decrease) in cash, cash equivalents and restricted cash	1,647	(5,995)
Cash, cash equivalents and restricted cash at beginning of period	64,870	112,260
Cash, cash equivalents and restricted cash at end of period	66,517	106,265
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	55	65
Cash paid during the period for income taxes	79	123
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	(549)	(432)
Issuance of common stock to Board of Directors	$ 410	$ 263