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CONSOLIDATED STATEMENTS OF CASH FLOWS (parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of cash and cash equivalents and restricted cash to the consolidated balance sheets      
Cash and cash equivalents $ 37,736 $ 38,808 $ 68,441
Restricted cash 2,709 994 1,573
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows 40,445 39,802 70,014
Supplemental cash flow information:      
Income taxes paid (133) (55) $ (81)
Interest expense paid (66) (4)  
Noncash investing activities:      
Issuance of convertible promissory notes as the consideration of acquisition of Ezbuy   (29,131)  
Acquisition of property, plant and equipment included in long-term payable (758) (1,170)  
Purchase of property and equipment included in accrued expenses and other current liabilities 758 $ 1,170  
Disposal of property and equipment included in prepaid expenses and other current assets (400)    
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities 10,060    
Disposal of long term investment included in amounts due from related parties $ 4,223