Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018		Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total Revenue	$ 65,764	$ 54,548	[1]	$ 128,077	$ 99,503	[1]
North America, primarily the United States
Disaggregation of Revenue [Line Items]
Total Revenue	48,869	39,169		95,204	68,506
Europe, Middle East & Africa
Disaggregation of Revenue [Line Items]
Total Revenue	10,764	9,504		20,868	19,660
Other locations
Disaggregation of Revenue [Line Items]
Total Revenue	6,131	5,875		12,005	11,337
IoT Products & Services Segment
Disaggregation of Revenue [Line Items]
Total Revenue	56,039	49,825		109,333	90,705	[1]
IoT Products & Services Segment | Hardware product
Disaggregation of Revenue [Line Items]
Total Revenue	52,097	47,588		102,909	86,042
IoT Products & Services Segment | Services
Disaggregation of Revenue [Line Items]
Total Revenue	3,942	2,237		6,424	4,663
IoT Solutions Segment
Disaggregation of Revenue [Line Items]
Total Revenue	9,725	4,723		18,744	8,798	[1]
IoT Solutions Segment | Solutions
Disaggregation of Revenue [Line Items]
Total Revenue	$ 9,725	$ 4,723		$ 18,744	$ 8,798

[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.