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SEGMENT REPORTING (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
segment
Dec. 31, 2015
segment
Segment reporting          
Number of operating segments | segment       2 1
Product sales $ 243,626 $ 227,539 $ 319,881    
Cost of revenues 146,029 166,343 214,261    
Total 243,626 227,539 319,881    
Cost of Product Sales 146,029 166,343 214,261    
Gross profit 97,597 61,196 105,620    
Unallocated operating expenses 113,649 98,677 115,787    
Loss from operations (16,052) (37,481) (10,167)    
Foreign Currency Transaction Gain (Loss), Unrealized 129 (339) (89)    
Interest income 297 487 581    
Interest expense (66) (5)      
Change in fair value of convertible promissory notes 14,591 (22,791)      
Other income, net 283        
Loss before income taxes and gain from equity method investment (947) (59,790) (9,675)    
Product sales          
Segment reporting          
Product sales 236,705 216,407 293,951    
Cost of revenues 144,061 156,326 189,816    
Total 236,705 216,407 293,951    
Cost of Product Sales 144,061 156,326 189,816    
Gross profit 92,644 60,081 104,135    
Service and others          
Segment reporting          
Product sales 6,921 11,132 25,930    
Cost of revenues 1,968 10,017 24,445    
Total 6,921 11,132 25,930    
Cost of Product Sales 1,968 10,017 24,445    
Gross profit $ 4,953 $ 1,115 $ 1,485