Related Party Balances and Transactions (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2022

Dec. 31, 2021

Related Party Transactions [Abstract]

Schedule of relationship with the group

Name	Relationship with the Group
Ochem Chemical Co., Ltd (“Ochem”)	Controlled by CEO
Ochemate Material Technologies Co., Ltd (“Ochemate”)	Controlled by CEO

(1)    Related party transaction

Name	Relationship with the Group
Ochem Chemical Co., Ltd (“Ochem”)	Controlled by CEO
Ochemate Material Technologies Co., Ltd (“Ochemate”)	Controlled by CEO

(1)    Related party transaction

Schedule of related party transactions

	Three Months Ended March 31,
	2021		2022
Raw material sold to Ochem	$	155	$	—

(2)    Interest-free loans

MPS received certain interest-free loans from related parties, Ochemate and Ochem, for the three months ended March 31, 2021 and 2022 with accumulative amounts of $1,874 and $0, respectively.

The outstanding balance for the amount due from Ochem was $85 as of December 31, 2021 and $0 as of March 31, 2022, respectively.

	Year Ended December 31,
	2019		2020		2021
Raw material sold to Ochem	$	—	$	167	$	390

(2)    Interest-free loans