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Fair Value Measurements
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The Company has certain financial assets and liabilities recorded at fair value which have been classified as Level 1, 2 or 3 within the fair value hierarchy as described in the accounting standards for fair value measurements.

The authoritative guidance for fair value measurements defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or the most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact, and (iv) willing to transact. The guidance prioritizes the inputs used in measuring fair value into the following hierarchy:
 
Level 1- Quoted prices (unadjusted) in active markets for identical assets or liabilities;

Level 2- Inputs other than quoted prices included within Level 1 that are either directly or indirectly observable; and

Level 3- Unobservable inputs in which little or no market activity exists, therefore requiring an entity to develop its own assumptions about the assumptions that market participants would use in pricing.

The following tables summarize the assets measured at fair value on a recurring basis (in thousands):
June 30, 2021
TotalLevel 1Level 2Level 3
Assets
Cash and cash equivalents:
Cash
$21,726 $21,726 $— $— 
Money market funds
258,994 258,994 — — 
Total cash and cash equivalents280,720 280,720 — — 
Short-term investments:
U.S. Treasury bills
58,573 58,573 — — 
Corporate debt securities
192,722 — 192,722 — 
Commercial paper
538,899 — 538,899 — 
U.S. Agency bonds
116,527 — 116,527 — 
Sovereign debt securities9,068 — 9,068 — 
Total short-term investments
915,789 58,573 857,216 — 
Long-term investment:
ORIC Pharmaceuticals, Inc.8,947 — — 8,947 
Total
$1,205,456 $339,293 $857,216 $8,947 


December 31, 2020
TotalLevel 1Level 2Level 3
Assets
Cash and cash equivalents:
Cash
$20,398 $20,398 $— $— 
Money market funds
865,164 865,164 — — 
Total cash and cash equivalents885,562 885,562 — — 
Short-term investments:
U.S. Treasury bills
49,546 49,546 — — 
Corporate debt securities
130,970 — 130,970 — 
Commercial paper
240,765 — 240,765 — 
U.S. Agency bonds
83,263 — 83,263 — 
Total short-term investments504,544 49,546 454,998 — 
Long-term investment:
ORIC Pharmaceuticals, Inc.15,629 — — 15,629 
Total
$1,405,735 $935,108 $454,998 $15,629 
    
The Company’s investments in Level 1 assets are valued based on publicly available quoted market prices for identical securities as of June 30, 2021 and December 31, 2020. The Company determines the fair value of Level 2 related securities with the aid of valuations provided by third parties using proprietary valuation models and analytical tools. These valuation models and analytical tools use market pricing or prices for similar instruments that are both objective and publicly available, including matrix pricing or reported trades, benchmark yields, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids and/or offers. As of June 30, 2021, the Level 3 fair value measurement of the Company’s long-term investment in ORIC, which the Company acquired as an investment in 2020, utilizes a combination of the Asian Protective Put Option and Finnerty Put Option fair value techniques with unobservable inputs of 79.0% volatility and an expected term of 0.6 years to determine the discount for lack of marketability of 14.0%. There were no transfers between fair value measurement levels during the three and six months ended June 30, 2021 or the year ended December 31, 2020.

The following table presents the changes in estimated fair value of the Company’s asset measured using significant unobservable inputs (Level 3) (in thousands):

June 30,
2021
Balance - December 31, 2020$15,629 
Change in fair value(6,682)
Balance - June 30, 2021$8,947