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Fair Value (Tables)
 3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Fair Value Assets Measured on a Recurring Basis The following fair value hierarchy table presents the Company’s assets measured at fair value on a recurring basis (in thousands):

 

 

Fair Value Measurement at Reporting Date Using

 

 

Total

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

March 31, 2019:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Assets

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

$

10,596

 

 

$

10,596

 

 

$

—

 

 

$

—

 

U.S. Treasury securities

 

70,671

 

 

 

70,671

 

 

 

—

 

 

 

—

 

 

$

81,267

 

 

$

81,267

 

 

$

—

 

 

$

—

 

December 31, 2018:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Assets

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

$

17,159

 

 

$

17,159

 

 

$

—

 

 

$

—

 

U.S. Treasury securities

 

63,651

 

 

 

63,651

 

 

 

—

 

 

 

—

 

 

$

80,810

 

 

$

80,810

 

 

$

—

 

 

$

—