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Accrued Expenses (Tables)
6 Months Ended
Jun. 30, 2020
Payables and Accruals [Abstract]  
Schedule of Accrued Expenses
As of June 30, 2020 and December 31, 2019, the Company's accrued expenses balance consists of the following (in thousands): 
June 30, 2020December 31, 2019
Accrued clinical trial expenses$4,942  $5,598  
Accrued professional fees8,639  12,581  
Accrued technical operation expenses4,762  6,446  
Accrued royalty and milestone payments3,025  3,117  
Accrued interest payable3,631  3,631  
Accrued sales allowances and related costs5,903  5,267  
Accrued construction costs201  2,689  
Other accrued expenses821  1,046  
 $31,924  $40,375