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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair value | Level 3    
Liabilities:    
Kolltan acquisition contingent consideration $ 22,367 $ 43,400
Fair Value Measurements | Level 2    
Assets:    
Money market funds and cash equivalents 28,986 24,061
Marketable securities 70,115 99,139
Total financial assets at fair value 99,101 123,200
Fair Value Measurements | Level 3    
Liabilities:    
Kolltan acquisition contingent consideration 22,367 43,400
Total financial liabilities at fair value 22,367 43,400
Fair Value Measurements | Fair value    
Assets:    
Money market funds and cash equivalents 28,986 24,061
Marketable securities 70,115 99,139
Total financial assets at fair value 99,101 123,200
Liabilities:    
Kolltan acquisition contingent consideration 22,367 43,400
Total financial liabilities at fair value $ 22,367 $ 43,400