Annual report pursuant to Section 13 and 15(d)

Investments in Non-Marketable Securities

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Investments in Non-Marketable Securities
12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Investments in Non-Marketable Securities Investments in Non-Marketable Securities
Non-Marketable Debt Securities
We classify non-marketable debt securities, which are accounted for as available-for-sale, within Level 3 in the fair value hierarchy because we estimate the fair value based on a qualitative analysis using the most recent observable transaction price and other significant unobservable inputs including volatility, rights, and obligations of the securities we hold.
We determine gains or losses on the sale or extinguishment of non-marketable debt securities using a specific identification method. Unrealized gains and losses on non-marketable debt securities are recorded as a component of other comprehensive loss until realized. Realized gains or losses are recorded as a component of other expenses, net. We recognized no unrealized or realized gains or losses during the year ended December 31, 2020. As of December 31, 2020 and 2019, the fair value of non-marketable debt securities was $1.0 million and nil, respectively.
As of December 31, 2020, the adjusted cost, carrying value and fair value of non-marketable debt securities is the following (in thousands):
  December 31, 2020
By contractual maturity: Adjusted Cost and Carrying value Fair Value
Non-marketable debt securities due in 1 year or less $ 1,000  $ 1,000 

There were no investments in non-marketable debt securities at December 31, 2019.
Non-Marketable Equity Securities
Non-marketable equity securities are investments in privately held companies without readily determinable market values. We measure investments in non-marketable equity securities without a readily determinable fair value using a measurement alternative that measures these securities at the cost method minus impairment, if any, plus or minus changes resulting from observable price changes on a non-recurring basis. The fair value of non-marketable equity securities that have been remeasured due to impairment are classified within Level 3. We adjust the carrying value of non-marketable equity securities which have been remeasured during the period and recognize resulting gains or losses as a component of other expenses, net. We recognized no unrealized or realized gain or losses during the year ended December 31, 2020.
At December 31, 2020 and 2019, the carrying value of non-marketable equity securities is the following (in thousands):
  December 31,
2020 2019
Non-marketable equity securities $ 1,450  $ —