Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Operating Activities:
Net income (loss)		$ 1,310	$ (1,556)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization		1,756	1,520
Stock-based compensation		1,231	903
Payment of contingent consideration obligations in excess of acquisition-date value		(2,041)
Contingent consideration (gain) expense		(35)	1,118
Unrealized foreign exchange (gain) loss			180
Deferred taxes	[1]	310	1,714
Gain on strategic investment		(7)	(177)
Provision for bad debts		63	28
Other		12	(7)
Change in operating assets and liabilities:
Accounts receivable and contract asset	[1]	(762)	484
Inventories		(161)	(345)
Prepaids and other		(649)	(1,188)
Accounts payable		190	(63)
Accrued liabilities		(3,737)	(2,232)
Income taxes	[1]	(496)	190
Deferred revenue	[1]	(2,389)	45
Net cash (used in) provided by operating activities		(5,405)	614
Investing Activities:
Purchases of property and equipment		(2,066)	(1,298)
Purchases of available-for-sale securities		(10,098)	(11,364)
Maturities of available-for-sale securities		20,000	18,400
Cash received from sale of strategic investment		7
Net cash provided by investing activities		7,843	5,738
Financing Activities:
Issuance of common stock		36	155
Payments for taxes related to net share settlement of equity awards		(2,661)	(1,130)
Payment of contingent consideration obligations		(9,064)
Net cash used in financing activities		(11,689)	(975)
Effect of exchange rate changes on cash, restricted cash and cash equivalents		(15)	35
Net change in cash, restricted cash and cash equivalents		(9,266)	5,412
Cash, Restricted Cash and Cash Equivalents:
Beginning of period		23,668	16,534
End of period		14,402	21,946
Supplemental Information:
Cash paid for income taxes		3	12
Noncash transactions from investing and financing activities:
Acquisition of property and equipment, net of refundable credits in other current assets and liabilities		$ 147	187
Strategic investment gain receivable included in other current assets			$ 177

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