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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of assets measured at fair value on recurring basis The following table summarizes assets that are measured at fair value on a recurring basis at September 30, 2018:
(in thousands)
Level 1
 
Level 2
 
Level 3
 
Total
Cash and cash equivalents
 
 
 
 
 
 
 
Money market funds
$
119,718

 
$
—

 
$
—

 
$
119,718

 
 
 
 
 
 
 
 
Short-term investments
 
 
 
 
 
 
 
Commercial paper
$
—

 
$
31,040

 
$
—

 
$
31,040

Corporate bonds
$
—

 
$
3,085

 
$
—

 
$
3,085