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FOLOTYN License Agreement and Development Liability (Tables)
 12 Months Ended
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]  
Schedule of Drug Development Liability Adjustments

FOLOTYN
Development
Liability,
Current
 
FOLOTYN
Development
Liability,
Long Term
 
FOLOTYN
Development
Liability, Total
Balance at December 31, 2017
$
275

 
$
12,111

 
$
12,386

Transfer from long-term to current in 2018
2,425

 
(2,425
)
 
—

(Less): Expenses incurred in 2018
(389
)
 
—

 
(389
)
Balance at December 31, 2018
$
2,311

 
$
9,686

 
$
11,997