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Marketable Securities
9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
The amortized cost and fair value of marketable securities was $0.8 million as of September 30, 2020, all of which consisted of money market mutual funds and was included in cash and cash equivalents.

Marketable securities consisted of the following (in thousands):

As of December 31, 2019
Amortized
Cost
Unrealized
Gains
Unrealized
Losses
Fair Value
U.S. treasury securities$13,602 $$— $13,603 
U.S. agency obligations6,400 — 6,401 
Money market mutual funds8,736 — — 8,736 
28,738 — 28,740 
Included in cash and cash equivalents12,329 — — 12,329 
Included in marketable securities$16,409 $$— $16,411