Shares of Chinese e-commerce companies have had a great year so far.

Dangdang (NYSE:DANG), a site that started as a Chinese bookseller but is transitioning to a peddler of all types of merchandise and media, has seen shares rise 35%. Vipshop (NYSE:VIPS), a company that offers flash sales on brand-name goods, has done even better, with shares up 135%.

But left behind in this run-up has been LightInTheBox (NYSE:LITB), an e-commerce company based in Mainland China, but with most of its customers coming from North America and Europe. Shares of the company are 27% lower than they were at the beginning of the year.

To find out why LightInTheBox's fate hasn't been nearly as good, and to see what investors should be watching moving forward, check out the slideshow below.