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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Laboratory service revenue $ 14,835 $ 4,266  
Gross Profit 5,776 54  
Inventory      
Raw materials 2,066 2,305  
Semi-finished and finished goods 6,091 3,118  
Total inventory $ 8,157 $ 5,423 $ 6,677