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Cash and Cash Equivalents (Tables)
 12 Months Ended
Dec. 31, 2018
Cash And Cash Equivalents [Abstract]  
Summary of Cash and Cash Equivalents

The following table summarizes the Company’s cash and cash equivalents:

 

 

 

December 31,

 

 

 

2018

 

 

2017

 

 

 

(in thousands)

 

U.S. Treasury securities

 

$

35

 

 

$

—

 

Cash

 

 

471

 

 

 

7,393

 

Commercial paper

 

 

5,974

 

 

 

—

 

Money market funds

 

 

31,740

 

 

 

44,182

 

Total cash and cash equivalents

 

$

38,220

 

 

$

51,575