Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	[1]	Jun. 30, 2019	Jun. 30, 2018	[1]
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 1,648	$ 2,904		$ 7,672	$ (1,709)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		532	(3,116)		(1,120)	(1,058)
Change in net unrealized gain (loss) on investments		4	(1)		18	(41)
Less income tax (expense) benefit		(1)	1		(5)	9
Reclassification of realized loss on investments included in net income	[2]	0	0		0	31
Less income tax benefit	[3]	0	0		0	(8)
Other comprehensive income (loss), net of tax		535	(3,116)		(1,107)	(1,067)
Comprehensive income (loss)		$ 2,183	$ (212)		$ 6,565	$ (2,776)

[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.

[2] Recorded in Other (expense) income, net in our Condensed Consolidated Statements of Operations.

[3] Recorded in Income tax expense in our Condensed Consolidated Statements of Operations.