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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Assets Measured at Fair Value
Assets measured at fair value on a recurring basis as of December 31, 2018 were as follows (in thousands):
 
Total
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs
(Level 3)
Money market funds, included in cash equivalents
$
41,434

 
$
41,434

 
$
—

 
$
—

Investments:
 
 
 
 
 
 
 
Corporate debt securities
67,843

 
—

 
67,843

 
—

U.S. Treasuries
53,758

 
53,758

 
—

 
—

Government agency securities
32,829

 
32,829

 
—

 
—

Totals
$
195,864

 
$
128,021

 
$
67,843

 
$
—

Assets measured at fair value on a recurring basis as of December 31, 2017 were as follows (in thousands):
 
Total
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs
(Level 3)
Money market funds, included in cash equivalents
$
21,059

 
$
21,059

 
$
—

 
$
—

Investments:
 
 
 

 
 

 
 

Corporate debt securities
65,173

 
—

 
65,173

 
—

U.S. Treasuries
110,948

 
110,948

 
—

 
—

Government agency securities
58,171

 
58,171

 
—

 
—

Totals
$
255,351

 
$
190,178

 
$
65,173

 
$
—