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FOLOTYN License Agreement and Development Liability (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2016
$
861

 
$
12,269

 
$
13,130

Transfer from long-term to current in 2017
158

 
(158
)
 
—

(Less): Expenses incurred in 2017
(744
)
 
—

 
(744
)
Balance at December 31, 2017
$
275

 
$
12,111

 
$
12,386