REVENUES

6 Months Ended

Jun. 30, 2022

Revenue from Contract with Customer [Abstract]

REVENUES

11. REVENUES

For each of the identified periods, revenues can be categorized into the following (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2022			2021			2022			2021
Product sales	$	3,192		$	1,976		$	6,754		$	3,241
Maintenance fees		9			12			20			23
Professional services		405			52			431			56
Shipping and handling		114			86			296			185
Discounts and allowances		(2	)		(5	)		(13	)		(12	)
Total revenues	$	3,718		$	2,121		$	7,488		$	3,493

During the three and six months ended June 30, 2022 38% and 43% of revenues were derived from customers located in California, respectively. During the three and six months ended June 30, 2021, 43% and 38% of revenues were derived from customers located in California, respectively. In addition, 2% of revenues in the six months ended June 30, 2022 were international sales compared to none in the same period in the prior year.

At June 30, 2022 and December 31, 2021, deferred revenue was $1.8 million and $0.3 million, respectively. These amounts represented customer deposits in the amount of $1.5 million and $0.1 million for June 30, 2022 and December 31, 2021, respectively and prepaid multi-year maintenance plans for previously sold products which account for $0.2 million and $0.2 million for June 30, 2022 and December 31, 2021, respectively and pertain to services to be provided through 2028.