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Summary of Significant Accounting Policies (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Summary of Assets Measured at Fair Value on Recurring Basis

The following table summarizes assets measured at fair value on a recurring basis at March 31, 2020 (in thousands):

 

Description    March 31,
2020		      Active
Markets
(Level 1)		      Observable
Inputs
(Level 2)		      Unobservable
Inputs
(Level 3)		  

Cash

    $ 17      $ 17      $ —        $ —    

Money market funds (included in cash and cash equivalents)

      61,215        61,215        —          —    

U.S. treasury securities (included in marketable securities)

      15,111        15,111        —          —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ 76,343      $ 76,343      $ —        $ —    
  

 

 

     

 

 

     

 

 

     

 

 

  

 

The following table summarizes assets measured at fair value on a recurring basis at December 31, 2019 (in thousands):

 

Description    December 31,
2019		      Active
Markets
(Level 1)		      Observable
Inputs
(Level 2)		      Unobservable
Inputs
(Level 3)		  

Money market funds (included in cash and cash equivalents)

    $ 33,774      $ 33,774      $ —        $ —    

U.S. treasury securities (included in marketable securities)

      57,699        57,699        —          —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ 91,473      $ 91,473      $ —        $ —    
  

 

 

     

 

 

     

 

 

     

 

 

  

The following table summarizes assets measured at fair value on a recurring basis at December 31, 2019 (in thousands):

 

Description    December 31,
2019		      Active
Markets
(Level 1)		      Observable
Inputs
(Level 2)		      Unobservable
Inputs
(Level 3)		  

Money market funds (included in cash and cash equivalents)

    $ 33,774      $ 33,774      $ —        $ —    

U.S. treasury securities (included in marketable securities)

      57,699        57,699        —          —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ 91,473      $ 91,473      $ —        $ —    
  

 

 

     

 

 

     

 

 

     

 

 

  

 

The following table summarizes assets measured at fair value on a recurring basis at December 31, 2018 (in thousands):

 

Description    December 31,
2018		      Active
Markets
(Level 1)		      Observable
Inputs
(Level 2)		      Unobservable
Inputs
(Level 3)		  

Money market funds (included in cash and cash equivalents)

    $ 6,804      $ 6,804      $ —        $ —    

U.S. treasury securities (included in cash and cash equivalents)

      238        238        —          —    

U.S. treasury securities (included in marketable securities)

      100,986        100,986        —          —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ 108,028      $ 108,028      $ —        $ —    
  

 

 

     

 

 

     

 

 

     

 

 

  
Schedule of Estimated Useful Lives of Property and Equipment  

The estimated useful lives of property and equipment are as follows:

 

     Useful Life
(in years)		  

Leasehold improvements

     

 Lesser of useful life or

remaining lease term

  

 

Machinery and equipment

      2-8 years  

Furniture and fixtures

      3-5 years  

Computers

      1-5 years  

Office equipment

      3-5 years  

Software

      3-5 years