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Fair Value Measurement (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis and indicates the level of the fair value hierarchy and the valuation techniques we utilized to determine such fair value:
As of September 30, 2021
Level 1Level 2Level 3Total
Assets:
Corporate notes and bonds$— $329,339 $— $329,339 
Corporate commercial paper— 555,924 — 555,924 
Obligations of U.S. government agencies— 5,882 — 5,882 
Money market funds48,336 — — 48,336 
Total assets$48,336 $891,145 $— $939,481 
Liabilities:
Development derivative liability$— $— $21,387 $21,387 
As of December 31, 2020
Level 1Level 2Level 3Total
Assets:
Corporate notes and bonds$— $687,469 $— $687,469 
Corporate commercial paper— 313,497 — 313,497 
Obligations of U.S. government agencies— 2,382 — 2,382 
Money market funds179,302 — — 179,302 
Total assets179,302 $1,003,348 $— $1,182,650 
Liabilities:
Development derivative liability$— $— $— $—