Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities:
Net (loss) income	$ (22)	$ 2,806
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	3,106	2,610
Stock-based compensation	2,003	1,671
Contingent consideration gain	(1,112)	(174)
Unrealized foreign exchange loss (income)	518	(473)
Deferred taxes	701	525
Gain on strategic investment	(177)
Provision for bad debts	25
Other	92	(25)
Change in operating assets and liabilities:
Accounts receivable	(15)	(223)
Inventories	(500)	132
Prepaids and other	(1,366)	(1,006)
Accounts payable and accrued liabilities	392	(1,959)
Income taxes	(776)	358
Deferred revenue	24,562	21
Net cash provided by operating activities	27,431	4,263
Investing Activities:
Purchases of property and equipment	(4,020)	(2,866)
Purchases of available-for-sale securities	(43,517)	(40,051)
Maturities of available-for-sale securities	33,000	27,071
Cash proceeds from sales of property and equipment	4
Cash received from sale of strategic investment	177
Net cash used in investing activities	(14,356)	(15,846)
Financing Activities:
Issuance of common stock	377	188
Payments for taxes related to net share settlement of equity awards	(1,132)	(2,127)
Payment of contingent consideration obligations	(925)
Payment of deferred financing costs		(97)
Net cash used in financing activities	(1,680)	(2,036)
Effect of exchange rate changes on cash and cash equivalents	133	(109)
Net change in cash and cash equivalents	11,528	(13,728)
Cash and Cash Equivalents:
Beginning of period	16,534	24,987
End of period	28,062	11,259
Supplemental Information:
Cash paid for income taxes	782	1,881
Noncash transactions from investing and financing activities:
Acquisition of property and equipment on account	329	$ 303
Accrued taxes related to net share settlement of equity awards	$ 1,222