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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of available-for-sale marketable securities and cash and cash equivalents
Available-for-sale marketable securities and cash and cash equivalents as of June 30, 2020 and December 31, 2019 consist of the following (in thousands):
 June 30, 2020
 Amortized Cost ValueGross 
Unrealized 
Gains		Gross 
Unrealized 
Losses		Fair Value
Cash and cash equivalents:    
Cash$8,616  $—  $—  $8,616  
Money market funds47,623  —  —  47,623  
Total$56,239  $—  $—  $56,239  
Marketable securities:    
Domestic corporate debt securities$64,443  $203  $(29) $64,617  
Domestic corporate commercial paper4,944  —  (66) 4,878  
Total$69,387  $203  $(95) $69,495  
 
 December 31, 2019
 Amortized Cost ValueGross 
Unrealized 
Gains		Gross 
Unrealized 
Losses		Fair Value
Cash and cash equivalents:    
Cash$34,726  $—  $—  $34,726  
Money market funds35,160  —  —  35,160  
Total$69,886  $—  $—  $69,886  
Marketable securities:    
Domestic corporate debt securities$41,229  $3  $(3) $41,229  
Domestic corporate commercial paper24,900  5  —  24,905  
Agency bonds12,391  1  (3) 12,389  
US treasury bonds12,492  —  —  12,492  
Total$91,012  $9  $(6) $91,015  
Schedule of debt securities, available for sale, unrealized loss position The following table summarizes such investments by major security type and length of time in a continuous unrealized loss position as of June 30, 2020 (in thousands).
Less than 12 Months12 months or longerTotal
Fair valueUnrealized lossesFair valueUnrealized lossesFair valueUnrealized losses
Available-for-sale debt securities
Corporate debt securities$10,600  $(29) —  —  $10,600  $(29) 
Corporate commercial paper4,878  (66) —  —  4,878  (66) 
Total available-for-sale debt securities$15,478  $(95) —  —  $15,478  $(95)