Segment Information (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2021

Dec. 31, 2020

Segment Reporting [Abstract]

Schedule of assets and revenues major geographic regions

	Three months ended June 30,						Six months ended June 30,
	2020			2021			2020			2021
Geographic regions	Amount	%		Amount	%		Amount	%		Amount	%
PRC	8,680	40	%	21,650	65	%	11,610	41	%	32,292	67	%
India	738	3	%	1,998	6	%	1,135	4	%	3,269	7	%
Russia	5,052	23	%	3,267	10	%	5,535	19	%	3,724	8	%
Other countries	332	2	%	2,169	6	%	407	1	%	2,283	5	%
Asia & Pacific	14,802	68	%	29,084	87	%	18,687	65	%	41,568	87	%
United Kingdom	1,212	6	%	3,508	11	%	3,504	12	%	5,212	10	%
Netherlands	4,187	19	%	2	0	%	4,192	15	%	22	0	%
Other countries	1,491	7	%	721	2	%	2,234	8	%	1,324	3	%
Europe	6,890	32	%	4,231	13	%	9,930	35	%	6,558	13	%
Other	6	0	%	57	0	%	30	0	%	184	0	%
Total	21,698	100	%	33,372	100	%	28,647	100	%	48,310	100	%

	Year ended December 31,
Geographic regions	2018			2019			2020
	Amount	%		Amount	%		Amount	%
PRC	146,235	84	%	49,346	64	%	66,160	62	%
India	—	0	%	4,988	7	%	8,570	8	%
Russia	10,869	6	%	3,673	5	%	5,671	5	%
Other countries	236	0	%	7,430	10	%	2,254	2	%
Asia & Pacific	157,340	90	%	65,437	86	%	82,655	77	%
United Kingdom	595	0	%	668	1	%	11,544	11	%
Netherlands	1,621	1	%	1,384	2	%	5,326	5	%
Other countries	14,352	9	%	8,627	11	%	7,444	7	%
Europe	16,568	10	%	10,679	14	%	24,314	23	%
Other	327	0	%	318	0	%	549	0	%
Total	174,235	100	%	76,434	100	%	107,518	100	%

Schedule of long-lived assets geographic regions

	December 31, 2020			June 30, 2021
Geographic regions	Amount	%		Amount	%
PRC	198,921	94	%	191,182	83	%
Asia & Pacific	198,921	94	%	191,182	83	%
Germany	12,747	6	%	21,462	9	%
United Kingdom	120	0	%	99	0	%
Europe	12,867	6	%	21,561	9	%
United States	230	0	%	18,930	8	%
Total	212,018	100	%	231,673	100	%