Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenues

Total revenue based on the disaggregation criteria described above is as follows (dollar in thousands):

	Three Months Ended September 30,								Nine Months Ended September 30,
	2021				2020				2021				2020
			% of Revenue				% of Revenue				% of Revenue				% of Revenue
	Revenue				Revenue				Revenue				Revenue
Revenue by geography:
North America	$	5,526	43	%	$	22,081	69	%	$	15,841	36	%	$	35,984	46	%
Asia Pacific	3,813		29	%	4,907		15	%	18,574		42	%	30,681		40	%
Europe, Middle East and Africa	3,721		28	%	5,111		16	%	9,967		22	%	10,851		14	%
Total	$	13,060	100	%	$	32,099	100	%	$	44,382	100	%	$	77,516	100	%
Revenue by products and services:
Products	$	11,782	90	%	$	26,099	81	%	$	34,345	77	%	$	53,948	70	%
License and services	1,278		10	%	6,000		19	%	10,037		23	%	23,568		30	%
Total	$	13,060	100	%	$	32,099	100	%	$	44,382	100	%	$	77,516	100	%
Revenue by timing of recognition:
Goods transferred at a point in time	$	11,738	90	%	$	31,024	97	%	$	40,680	92	%	$	75,946	98	%
Goods and services transferred over time	1,322		10	%	1,075		3	%	3,702		8	%	1,570		2	%
Total	$	13,060	100	%	$	32,099	100	%	$	44,382	100	%	$	77,516	100	%

Contract Assets and Contract Liabilities

Contract assets and contract liabilities consisted of the following as of September 30, 2021 and December 31, 2020 (in thousands):

	September 30,		December 31,
	2021		2020
Contract assets, current
Unbilled accounts receivable	$	3,313	$	2,813
Contract assets, long-term
Unbilled accounts receivable	10,148		8,440
Total contract assets	$	13,461	$	11,253
Contract liabilities, current
Deferred revenue, current	$	7,283	$	7,143
Customer advance payment	326		180
Total	7,609		7,323
Contract liabilities, long-term
Deferred revenue, long-term	12,706		14,732
Total contract liabilities	$	20,315	$	22,055

The following table shows the significant changes in contract assets and contract liabilities balances (in thousands):

	Nine Months Ended September 30,
	2021		2020
Contract assets:
Beginning balance	$	11,253	$	—
Transferred to receivables from contract assets recognized at the beginning of the period	(2,813)		—
Increase due to unbilled and recognized as revenue in excess of billings during the period, net of amounts transferred to receivables	5,021		8,439
Ending balance	$	13,461	$	8,439
Contract liabilities:
Beginning balance	$	22,055	$	19,164
Revenue recognized that was included in the contract liabilities beginning balance	(9,729)		(12,016)
Increase due to cash received and not recognized as revenue and billings in excess of revenue recognized during the period	7,989		20,611
Customer deposits reclassified to refund liabilities	—		(6,083)
Ending balance	$	20,315	$	21,676