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NONVESTED SHARES - Share-based Compensation Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based compensation expenses      
Incremental compensation expenses $ 2,060 $ 405 $ 1,865
Fulfillment      
Share-based compensation expenses      
Incremental compensation expenses 238 47 214
Selling and marketing      
Share-based compensation expenses      
Incremental compensation expenses 408 99 456
General and administrative      
Share-based compensation expenses      
Incremental compensation expenses $ 1,414 $ 259 $ 1,195