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Fair value (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities that are measured at fair value on a recurring basis
The following tables summarize our assets that are measured at fair value as of September 30, 2018 and December 31, 2017 (in thousands):
Description
 
Balance as of September 30, 2018
 
Level 1
 
Level 2
 
Level 3
Assets:
 
 

 
 

 
 

 
 

Cash and money market funds
 
$
31,917

 
$
31,917

 
$
—

 
$
—

Corporate debt securities (including commercial paper)
 
8,968

 
—

 
8,968

 
—

U.S. government securities
 
5,465

 
—

 
5,465

 
—

Total
 
$
46,350

 
$
31,917

 
$
14,433

 
$
—


Description
 
Balance as of
December 31,  2017
 
Level 1
 
Level 2
 
Level 3
Assets:
 
 

 
 

 
 

 
 

Cash and money market funds
 
$
15,703

 
$
15,703

 
$
—

 
$
—

Corporate debt securities (including commercial paper)
 
35,531

 
—

 
35,531

 
—

U.S. government securities
 
15,969

 
—

 
15,969

 
—

Total
 
$
67,203

 
$
15,703

 
$
51,500

 
$
—