Segment Information and Major Customers Summary of Operating Results by Segment (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									2
Revenue	$ 73,169	$ 70,338	$ 73,447	$ 62,317	$ 64,960	$ 61,166	$ 65,764	$ 62,313	$ 279,271	$ 254,203	$ 226,893
Gross profit	$ 37,518	$ 37,349	$ 38,641	$ 30,464	$ 30,595	$ 28,328	$ 30,329	$ 29,783	143,972	119,035	109,054
Depreciation and amortization									19,299	13,396	12,784
IoT Products & Services
Segment Reporting Information [Line Items]
Revenue									249,530	215,287	201,506
Gross profit									129,349	100,522	97,895
Depreciation and amortization									11,521	6,102	6,040
IoT Solutions
Segment Reporting Information [Line Items]
Revenue									29,741	38,916	25,387
Gross profit									14,623	18,513	11,159
Depreciation and amortization									$ 7,778	$ 7,294	$ 6,744