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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-Sale Securities

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

 

 

June 30, 2022

 

 

December 31, 2021

 

 

Cost

 

 

Unrealized Gain

 

 

Unrealized (Loss)

 

 

Estimated Fair Value

 

 

Cost

 

 

Unrealized Gain

 

 

Unrealized (Loss)

 

 

Estimated Fair Value

 

Money market funds

$

41,201

 

 

$

—

 

 

$

—

 

 

$

41,201

 

 

$

56,337

 

 

$

—

 

 

$

—

 

 

$

56,337

 

 

$

41,201

 

 

$

—

 

 

$

—

 

 

$

41,201

 

 

$

56,337

 

 

$

—

 

 

$

—

 

 

$

56,337

 

Classified as:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash equivalents

 

 

 

 

 

 

 

 

 

$

40,931

 

 

 

 

 

 

 

 

 

 

 

$

56,067

 

Restricted cash

 

 

 

 

 

 

 

 

 

 

270

 

 

 

 

 

 

 

 

 

 

 

 

270

 

Total cash equivalents,
   restricted cash and
   investments

 

 

 

 

 

 

 

 

 

$

41,201

 

 

 

 

 

 

 

 

 

 

 

$

56,337