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9. COMMITMENTS AND CONTINGENCIES - Product warranties (Details)	3 Months Ended
	Jun. 30, 2020
Product warranties
Warranty period	3 years

Represents the period for which the entity warranties its products.

No definition available.

Name:	gsit_WarrantyPeriod
Namespace Prefix:	gsit_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

No definition available.

Name:	us-gaap_StandardProductWarrantyDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration