Revenue and Deferred Revenue (Tables)

3 Months Ended

Mar. 31, 2023

Revenue and Deferred Revenue

Summary of deferred revenue

	March 31, 2023
Deferred revenue - short term	$	2,386
Revenue recognized in the three months ended related to amounts included in deferred revenue as of January 1, 2023	$	638

Summary of revenue by timing of recognition

	Three Months Ended March 31,
	2023						2022
	Point in time		Over time		Total		Point in time		Over time		Total
ASRs	$	20	$	1,002	$	1,022	$	15	$	929	$	944
Blue light Towers, ephones and Call Boxes		1,787		88		1,875		—		—		—
Total	$	1,807	$	1,090	$	2,897	$	15	$	929	$	944