Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net income (loss)		$ 2,572	$ (22)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization		3,575	3,106
Stock-based compensation		2,190	2,003
Payment of contingent consideration obligations in excess of acquisition-date value		(2,041)
Contingent consideration gain		(352)	(1,112)
Unrealized foreign exchange gain			518
Deferred taxes	[1]	(213)	701
Gain on strategic investment		(7)	(177)
Provision for bad debts		119	25
Other		(10)	92
Change in operating assets and liabilities:
Accounts receivable and contract asset	[1]	(756)	(15)
Inventories		(355)	(500)
Prepaids and other		(1,430)	(1,366)
Accounts payable		1,273	(418)
Accrued liabilities		(4,071)	810
Income taxes	[1]	(291)	(776)
Deferred revenue	[1]	(4,141)	24,562
Net cash (used in) provided by operating activities		(3,938)	27,431
Investing Activities:
Purchases of property and equipment		(3,118)	(4,020)
Purchases of available-for-sale securities		(20,085)	(43,517)
Maturities of available-for-sale securities		37,458	33,000
Cash proceeds from sales of property and equipment		10	4
Cash received from sale of strategic investment		7	177
Net cash provided by (used in) investing activities		14,272	(14,356)
Financing Activities:
Issuance of common stock		264	377
Payments for taxes related to net share settlement of equity awards		(2,678)	(1,132)
Payment of contingent consideration obligations		(9,064)	(925)
Net cash used in financing activities		(11,478)	(1,680)
Effect of exchange rate changes on cash, restricted cash and cash equivalents		(54)	133
Net change in cash, restricted cash and cash equivalents		(1,198)	11,528
Cash, Restricted Cash and Cash Equivalents:
Beginning of period		23,668	16,534
End of period		22,470	28,062
Supplemental Information:
Cash paid for income taxes		150	782
Noncash transactions from investing and financing activities:
Acquisition of property and equipment, net of refundable credits in other current assets and liabilities		$ 65	329
Accrued taxes related to net share settlement of equity awards			$ 1,222

[1] Amounts presented are net of impact from adoption of ASC Topic 606.