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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 determines the fair value of its financial instruments based upon the fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Below are the three levels of inputs that may be used to measure fair value:
Level 1—Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
Level 2—Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
Transfers into or out of any hierarchy level are recognized at the end of the reporting period in which the transfers occurred. There were no material transfers between any levels during the nine months ended September 30, 2020. There were no material transfers between any levels during 2019.
The following table summarizes the financial instruments measured at fair value on a recurring basis in the Company’s accompanying condensed consolidated balance sheets as of September 30, 2020 and December 31, 2019 (in thousands):
 As of September 30, 2020
 Level 1Level 2Level 3Total
Assets    
Cash and cash equivalents:    
Cash$55,796 $— $— $55,796 
Money market funds (1)26,034 — — 26,034 
Total$81,830 $— $— $81,830 
Marketable Securities    
Domestic corporate debt securities (2)$— $38,910 $— $38,910 
Domestic corporate commercial paper (2)— 4,963 — 4,963 
Total$— $43,873 $— $43,873 
 
 As of December 31, 2019
 Level 1Level 2Level 3Total
Assets    
Cash and cash equivalents:    
Cash$34,726 $— $— $34,726 
Money market funds (1)35,160 — — 35,160 
Total$69,886 $— $— $69,886 
Marketable Securities    
Domestic corporate debt securities (2)$— $41,229 $— $41,229 
Domestic corporate commercial paper (2)— 24,905 — 24,905 
Agency bonds (2)— 12,389 — 12,389 
US treasury bonds (2)$— $12,492 $— $12,492 
Total$— $91,015 $— $91,015 
(1)                           Fair value is based upon quoted market prices.
(2)                           Fair value is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets. Inputs are obtained from various sources, including market participants, dealers and brokers.
As of September 30, 2020, the carrying amounts of the cash and cash equivalents, restricted cash, accounts receivable, prepaid expenses, other current assets, accounts payable, accrued expenses, long-term debt and operating lease liabilities approximated their estimated fair values.