REVENUES - Schedule of Revenues Disaggregated by Major Products and Service Lines and Timing of Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 322,606	$ 310,867	$ 594,512	$ 561,944
Revenue from goods or services transferred to customers over time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	80,122	81,812	158,695	145,635
Revenue from goods or services transferred to customers at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	242,484	229,055	435,817	416,309
Off-platform ecommerce
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	131,176	122,825	227,526	216,171
GigaCloud 1P
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	94,209	92,033	175,594	172,984
Others
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	297	222	400	379
Product sales to B
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	64,414	73,968	108,399	125,402
Product sales to C
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	66,762	48,857	119,127	90,769
Platform commission
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	4,806	4,479	9,141	8,077
Ocean transportation service
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	8,312	15,504	19,670	25,305
Drayage service
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	3,242	3,617	6,014	7,167
Warehousing service
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	13,480	9,589	27,558	18,916
Last-mile delivery service
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	53,949	51,959	103,193	91,922
Packaging service
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	8,267	7,686	15,517	13,965
Others
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	4,868	2,953	9,899	7,058
Service revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	96,924	95,787	190,992	172,410
Revenues	96,924	95,787	190,992	172,410
Total product revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	225,682	215,080	403,520	389,534
Revenues	$ 225,682	$ 215,080	$ 403,520	$ 389,534