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Fair Value Measurements
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The Company establishes the fair value of its assets and liabilities using the price that would be received to sell an asset or paid to transfer a financial liability in an orderly transaction between market participants at the measurement date. A fair value hierarchy is used to measure fair value. The three levels of the fair value hierarchy are as follows:
Level 1 — Quoted prices in active markets for identical assets and liabilities.
Level 2 — Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets.
Level 3 — Valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.
    The recorded amounts of certain financial instruments, including cash, accounts receivable, prepaid expenses and other, accounts payable and accrued liabilities, approximate fair value due to their relatively short-term maturities.
    The Company’s investments by level within the fair value hierarchy were as follows (in thousands):
As of September 30, 2020Level 1Level 2Level 3Total
Cash equivalents:
Money market fund$161,866 $— $— $161,866 
Short-term investments:
Corporate debt securities— 43,045 — 43,045 
U.S. government-related debt securities— 15,052 — 15,052 
Asset-backed securities— 1,477 — 1,477 
Total$161,866 $59,574 $— $221,440 
As of December 31, 2019Level 1Level 2Level 3Total
Cash equivalents:
Money market fund$22,152 $— $— $22,152 
Short-term investments:
Corporate debt securities— 78,330 — 78,330 
U.S. government-related debt securities— 27,003 — 27,003 
Asset-backed securities— 11,971 — 11,971 
Corporate equity securities10,518 — — 10,518 
Total$32,670 $117,304 $— $149,974 
    In March 2020, the Company issued $230.0 million of Convertible Notes of which $88.6 million was used to repay amounts owed and fees associated with the termination of its term loan agreement and revolving line of credit as described in more detail in Note 9. Long-term Debt, Net. As of September 30, 2020, the fair value of the Convertible Notes was $279.9 million. The estimated fair value of the Convertible Notes, which are classified as Level 2 financial instruments, was determined based on the estimated or actual bid prices of the Convertible Notes in an over-the-counter market.