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Liability Related to Sale of Future Royalties (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of activity within liability related to sale of future royalties The following table shows the activity within the liability related to sale of future royalties for the six months ended June 30, 2018:
 
 
Liability Related to Sale of Future Royalties
Transaction date balance
 
$
106,047

Non-cash interest expense recognized, net of transaction cost amortization
 
500

Balance at June 30, 2018
 
106,547

Less: Unamortized transaction costs
 
(265
)
Carrying value at June 30, 2018
 
$
106,282