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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following tables summarize assets and liabilities measured at fair value on a recurring basis as of December 31, 2018 and 2017 and the input categories associated with those assets and liabilities:

 

 

 

December 31, 2018

 

(in thousands)

 

Level 1

 

 

Level 2

 

 

Level 3

 

Cash equivalents:

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

 

$

16,292

 

 

$

—

 

 

$

—

 

Commercial paper

 

 

 

 

 

 

1,998

 

 

 

 

 

Totals

 

$

16,292

 

 

$

1,998

 

 

$

—

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Marketable securities

 

 

 

 

 

 

 

 

 

 

 

 

Commercial paper

 

$

—

 

 

$

31,766

 

 

$

—

 

Corporate debt securities

 

 

—

 

 

 

7,479

 

 

 

—

 

Government securities

 

 

—

 

 

 

11,954

 

 

 

—

 

Totals

 

$

—

 

 

$

51,199

 

 

$

—

 

 

 

 

 

December 31, 2017

 

(in thousands)

 

Level 1

 

 

Level 2

 

 

Level 3

 

Assets:

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

 

$

89,310

 

 

$

—

 

 

$

—

 

Totals

 

$

89,310

 

 

$

—

 

 

$

—