Annual report pursuant to Section 13 and 15(d)

Accrued Expenses - Summary (Details)

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Accrued Expenses - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued expenses    
Accrued license obligations $ 2,523 $ 806
Compensation expense 2,380 2,325
Research and development fees 1,945 791
Professional fees 943 516
Audit and tax fees 378 424
Other current liabilities 945 1,308
Total $ 9,114 $ 6,170