REVENUE (Tables)

3 Months Ended

Mar. 31, 2021

Revenue From Contract With Customer [Abstract]

Disaggregation of revenue by major products and services lines and timing of revenue recognition

In the following table, revenue is disaggregated by performance obligation and timing of revenue recognition. All revenue comes from contracts with customers. See Note 9 for the disaggregation of revenue by geographic region.

	For the Three Months Ended March 31,
	2021		2020
Product		25,836		35,998
Transportation		2,499		3,995
License fees from Distribution Partners		207		306
Total product revenue		28,542		40,299
Installation and other services		923		682
		29,465		40,981

	For the Three Months Ended March 31,
	2021		2020
At a point in time		28,335		39,993
Over time		1,130		988
		29,465		40,981

Summary of contract liabilities

Contract Liabilities

	As at
	March 31, 2021		December 31, 2020		December 31, 2019
Customer deposits		2,975		1,292		2,436
Deferred revenue		455		527		1,131
Contract liabilities		3,430		1,819		3,567

Schedule of sales by industry

	For the three months ended March 31,
	2021		2020
Commercial		16,144		28,274
Healthcare		6,487		5,063
Government		4,181		3,127
Education		1,523		3,529
License fees from Distribution Partners		207		306
Total product and transportation revenue		28,542		40,299
Installation and other services		923		682
		29,465		40,981