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Investments (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Cost, Gross Unrealized Holding Gains, Gross Unrealized Holding Losses and Fair Value of Available for Sale Investments

The Company's available-for-sale investments consisted of the following (in thousands):

 

June 30, 2022

 

Amortized
Cost

 

 

Unrealized
Gains

 

 

Unrealized
Losses

 

 

Estimated
Fair Value

 

Short-term

 

 

 

 

 

 

 

 

 

 

 

 

U.S. treasury securities

 

$

177,275

 

 

$

—

 

 

$

(1,205

)

 

$

176,070

 

Certificates of deposit

 

 

1,925

 

 

 

—

 

 

 

(11

)

 

 

1,914

 

Short-term investments

 

$

179,200

 

 

$

—

 

 

$

(1,216

)

 

$

177,984

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Long-term

 

 

 

 

 

 

 

 

 

 

 

 

U.S. treasury securities

 

$

9,807

 

 

$

—

 

 

$

—

 

 

$

9,807

 

Certificates of deposit

 

 

980

 

 

 

—

 

 

 

(15

)

 

 

965

 

Long-term investments

 

$

10,787

 

 

$

—

 

 

$

(15

)

 

$

10,772

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2021

 

 

 

 

 

 

 

 

 

 

 

 

Short-term

 

 

 

 

 

 

 

 

 

 

 

 

U.S. treasury securities

 

$

10,014

 

 

$

—

 

 

$

(1

)

 

$

10,013

 

Certificates of deposit

 

 

961

 

 

 

—

 

 

 

(1

)

 

 

960

 

Short-term investments

 

$

10,975

 

 

$

—

 

 

$

(2

)

 

$

10,973

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Long-term

 

 

 

 

 

 

 

 

 

 

 

 

U.S. treasury securities

 

$

42,517

 

 

$

—

 

 

$

(98

)

 

$

42,419

 

Certificates of deposit

 

 

970

 

 

 

—

 

 

 

(3

)

 

 

967

 

Long-term investments

 

$

43,487

 

 

$

—

 

 

$

(101

)

 

$

43,386