Segment Information and Major Customers Summary of Operating Results by Segment (Details) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	[1]	Jun. 30, 2018 USD ($)	[1]	Mar. 31, 2018 USD ($)	[1]	Dec. 31, 2017 USD ($)	[1]	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)	[1]	Sep. 30, 2017 USD ($)	[1]
Segment Reporting Information [Line Items]
Number of reportable segments | segment													2
Revenue	$ 64,960	$ 61,166	$ 65,764	$ 62,313	$ 65,118		$ 62,272		$ 54,548		$ 44,955		$ 254,203	$ 226,893		$ 181,340
Operating income (loss)													10,072	2,782		8,866
Depreciation and amortization													13,396	12,784		5,565
IoT Products & Services
Segment Reporting Information [Line Items]
Revenue													215,287	201,506		174,237
Operating income (loss)													18,674	14,923		12,804
Depreciation and amortization													6,102	6,040		3,575
IoT Solutions
Segment Reporting Information [Line Items]
Revenue													38,916	25,387		7,103
Operating income (loss)													(8,602)	(12,141)		(3,938)
Depreciation and amortization													$ 7,294	$ 6,744		$ 1,990

[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.