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(LOSS) / INCOME PER SHARE - Computation of Basic and Diluted Net (Loss)/Income Per Ordinary Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net (loss) / income attributable to ordinary shareholders of LightInTheBox Holding Co., Ltd.	$ 999	$ (59,602)	$ (9,548)
Change in fair value of convertible promissory notes	$ 14,591	$ (22,791)
Denominator:
Weighted average number of shares used in calculating net (loss) / income per ordinary share -basic	137,588,401	134,495,549	137,641,562
Weighted average number of shares used in calculating net loss per ordinary share -diluted	223,517,833	134,495,549	137,641,562
Net (loss) / income per ordinary share - basic (in dollars per share)	$ 0.01	$ (0.44)	$ (0.07)
Net loss per ordinary share-diluted	$ (0.06)	$ (0.44)	$ (0.07)

X

- Definition

The amount of change in fair value of convertible promissory note.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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