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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Summary of Fair Value and Amortized Cost of Cash Equivalents and Available-for-sale Investments by Major Security Type

The fair value and amortized cost of cash equivalents and available-for-sale investments by major security type are presented in the following table (in thousands):

 

 

 

March 31, 2021

 

 

 

Amortized

Cost

 

 

Unrealized

Gain

 

 

Unrealized

Loss

 

 

Estimated

Fair

Value

 

Cash equivalents and investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market fund

 

$

89,221

 

 

$

 

 

$

 

 

$

89,221

 

U.S. treasury bills

 

 

6,000

 

 

 

 

 

 

 

 

 

6,000

 

Corporate debt securities

 

 

6,500

 

 

 

6

 

 

 

 

 

 

6,506

 

Commercial paper

 

 

104,892

 

 

 

 

 

 

 

 

 

104,892

 

U.S. government bonds

 

 

5,037

 

 

 

1

 

 

 

 

 

 

5,038

 

Total cash equivalents and investments

 

$

211,650

 

 

$

7

 

 

$

 

 

$

211,657

 

Classified as:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash equivalents

 

 

 

 

 

 

 

 

 

 

 

 

 

$

89,221

 

Short-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

122,436

 

Total cash equivalents and investments

 

 

 

 

 

 

 

 

 

 

 

 

 

$

211,657

 

 

 

 

December 31, 2020

 

 

 

Amortized

Cost

 

 

Unrealized

Gain

 

 

Unrealized

Loss

 

 

Estimated

Fair

Value

 

Cash equivalents and investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market fund

 

$

127,783

 

 

$

 

 

$

 

 

$

127,783

 

U.S. treasury bills

 

 

29,995

 

 

 

2

 

 

 

 

 

 

29,997

 

Corporate debt securities

 

 

23,126

 

 

 

75

 

 

 

 

 

 

23,201

 

Commercial paper

 

 

41,460

 

 

 

 

 

 

 

 

 

41,460

 

U.S. government bonds

 

 

5,067

 

 

 

 

 

 

(1

)

 

 

5,066

 

Asset-backed securities

 

 

2,001

 

 

 

5

 

 

 

 

 

 

2,006

 

Total cash equivalents and investments

 

$

229,432

 

 

$

82

 

 

$

(1

)

 

$

229,513

 

Classified as:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash equivalents

 

 

 

 

 

 

 

 

 

 

 

 

 

$

139,779

 

Short-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

89,734

 

Total cash equivalents and investments

 

 

 

 

 

 

 

 

 

 

 

 

 

$

229,513