XML 23 R11.htm IDEA: XBRL DOCUMENT v3.20.2
Cash and Cash Equivalents and Investments
 9 Months Ended
Sep. 30, 2020
Cash and Cash Equivalents and Investments [Abstract]  
Cash and Cash Equivalents Disclosure Cash and Cash Equivalents and Investments 
The fair value of cash and cash equivalents and investments held at September 30, 2020 and December 31, 2019 are as follows: 
 As of September 30, 2020
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
 (in thousands)
Cash and cash equivalents$52,251 $— $— $52,251 
Securities maturing within one year:    
U.S. treasury securities38,796 40 — 38,836 
Corporate debt securities20,364 1 (6)20,359 
Total short-term investments$59,160 $41 $(6)$59,195 
Total cash and cash equivalents and investments$111,411 $41 $(6)$111,446 
 As of December 31, 2019
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
  (in thousands) 
Cash and cash equivalents$36,112 $— $— $36,112 
Securities maturing within one year:    
U.S. treasury securities235,463 94 (10)235,547 
Total short-term investments$235,463 $94 $(10)$235,547 
Total cash and cash equivalents and investments
$271,575 $94 $(10)$271,659 

There were no realized losses during either of the nine months ended September 30, 2020 and 2019, respectively. The cost of securities sold is based on the specific identification method.