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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Financial Assets Carried at Fair Value

The financial assets carried at fair value were determined using the following inputs (in thousands):

 

 

Balance at

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2018

 

 

(Level 1)

 

 

(Level 2)

 

 

(Level 3)

 

Cash equivalents:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

$

485,872

 

 

$

485,872

 

 

$

 

 

$

 

 

 

Balance at

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2017

 

 

(Level 1)

 

 

(Level 2)

 

 

(Level 3)

 

Cash equivalents:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

$

110,299

 

 

$

110,299

 

 

$

 

 

$