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Financial Instruments
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Financial Instruments

4. Financial Instruments

Cash equivalents and investments, all of which are classified as available-for-sale securities and restricted cash, consisted of the following (in thousands):

 

 

March 31, 2022

 

 

December 31, 2021

 

 

Cost

 

 

Unrealized Gain

 

 

Unrealized (Loss)

 

 

Estimated Fair Value

 

 

Cost

 

 

Unrealized Gain

 

 

Unrealized (Loss)

 

 

Estimated Fair Value

 

Money market funds

$

43,944

 

 

$

—

 

 

$

—

 

 

$

43,944

 

 

$

56,337

 

 

$

—

 

 

$

—

 

 

$

56,337

 

 

$

43,944

 

 

$

—

 

 

$

—

 

 

$

43,944

 

 

$

56,337

 

 

$

—

 

 

$

—

 

 

$

56,337

 

Classified as:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash equivalents

 

 

 

 

 

 

 

 

 

$

43,674

 

 

 

 

 

 

 

 

 

 

 

$

56,067

 

Restricted cash

 

 

 

 

 

 

 

 

 

 

270

 

 

 

 

 

 

 

 

 

 

 

 

270

 

Total cash equivalents,
   restricted cash and
   investments

 

 

 

 

 

 

 

 

 

$

43,944

 

 

 

 

 

 

 

 

 

 

 

$

56,337

 

 

There have been no significant realized gains or losses on available-for-sale securities for the periods presented. As of March 31, 2022 and December 31, 2021, there were no unrealized losses on cash equivalents. As of March 31, 2022, the Company had a total of $44.9 million in cash, cash equivalents and restricted cash, which includes approximately $1 million in cash and $43.9 million in cash equivalents and restricted cash.