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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of Assets Measured at Fair Value on a Recurring Basis
The following table summarizes the assets measured at fair value as of December 31, 2018 and 2019:
Amortized cost or carrying valueUnrealized gainsUnrealized lossesFair value measurements on a recurring basis
December 31, 2018
Level 1Level 2Level 3Total
Financial assets:
Cash and cash equivalents:
Money market account$8,194  $—  $—  $8,194  $—  $—  $8,194  
U.S. Reverse repurchase agreements26,000  —  —  —  26,000  —  26,000  
Total included in cash and cash equivalents34,194  —  —  8,194  26,000  —  34,194  
Marketable securities:
U.S. treasury securities17,402  —  (2) 17,400  —  —  17,400  
Total marketable securities17,402  —  (2) 17,400  —  —  17,400  
Total financial assets$51,596  $—  $(2) $25,594  $26,000  $—  $51,594  
        
Fair value measurements on a recurring basis
December 31, 2019
Level 1Level 2Level 3Total
Financial assets:
Cash and cash equivalents:
Money market account$25,000  $—  $—  $25,000  
Time deposits75,250  —  75,250  
Total financial assets$100,250  —  —  $100,250