Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 3,605	$ 4,969
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion expense	1,685	1,081
Stock-based compensation expense	1,581	920
Provision adjustments related to doubtful accounts	7	4
Provision adjustments related to product warranty	303	234
Impairments	468	0
Recognition of previously deferred gain on sale of assets from discontinued operations	0	3,804
Other	574	(1,422)
Total non-cash adjustments	4,618	(2,987)
Changes in operating assets and liabilities:
Accounts receivable	975	(2,017)
Inventory	(2,357)	228
Other assets	(1,582)	1,323
Accounts payable	1,489	1,172
Accrued expenses and other current liabilities	1,035	(2,413)
Total change in operating assets and liabilities	(440)	(1,707)
Net cash provided by operating activities	7,783	275
Cash flows from investing activities:
Purchase of equipment	(4,567)	(2,685)
Net cash used in investing activities	(4,567)	(2,685)
Cash flows from financing activities:
Proceeds from stock plans	779	597
Net cash provided by financing activities	779	597
Effect of exchange rate changes on foreign currency	(67)	113
Net increase (decrease) in cash and cash equivalents	3,928	(1,700)
Cash, cash equivalents and restricted cash at beginning of period	64,870	112,260
Cash, cash equivalents and restricted cash at end of period	68,798	110,560
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	38	44
Cash paid during the period for income taxes	79	108
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	(255)	(191)
Issuance of common stock to Board of Directors	$ 410	$ 263