XML 31 R20.htm IDEA: XBRL DOCUMENT v3.21.2
Short-Term Investments (Tables)
6 Months Ended
Jun. 30, 2021
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 securities consisted of the following (in thousands):

 

At June 30, 2021

 

Amortized
Cost

 

 

Unrealized
Gains

 

 

Unrealized
Losses

 

 

Estimated
Fair Value

 

U.S. treasury securities

 

$

90,987

 

 

$

3

 

 

$

 

 

$

90,990

 

Total

 

$

90,987

 

 

$

3

 

 

$

 

 

$

90,990

 

At December 31, 2020

 

 

 

 

 

 

 

 

 

 

 

 

U.S. treasury securities

 

$

215,185

 

 

$

 

 

$

(31

)

 

$

215,154

 

Total

 

$

215,185

 

 

$

 

 

$

(31

)

 

$

215,154