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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table presents the hierarchy for our assets and liabilities measured at fair value (in thousands):
September 30, 2018December 31, 2017
Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total 
Assets: 
Short-term investments(1)
$106,866 $889,445 $— $996,311 $1,896 $179,145 $— $181,041 
Note receivable Viking — — — — — — 3,877 3,877 
Investment in warrants(2)
24,284 — — 24,284 3,846 — — 3,846 
Total assets $131,150 $889,445 $— $1,020,595 $5,742 $179,145 $3,877 $188,764 
Liabilities: 
Crystal contingent liabilities(3)
$— $— $7,401 $7,401 $— $— $8,401 8,401 
CyDex contingent liabilities(4)
— — 514 514 — — 1,589 1,589 
Metabasis contingent liabilities(5)
— 4,816 — 4,816 — 3,971 — 3,971 
Total liabilities $— $4,816 $7,915 $12,731 $— $3,971 $9,990 $13,961