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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

We measure cash, cash equivalents and short-term investments at fair value on a recurring basis. The fair values of these such assets were as follows (in thousands):

 

 

 

Fair Value Measurements at Reporting Date Using

 

 

 

Balance at

December 31,

2020

 

 

Quoted

Prices in

Active

Markets for

Identical

Assets

(Level 1)

 

 

Significant

Other

Observable

Inputs

(Level 2)

 

 

Significant

Unobservable

Inputs

(Level 3)

 

Cash and money market funds

 

$

49,149

 

 

$

49,149

 

 

$

 

 

$

 

U.S. treasury bills and government agency obligations

 

 

20,276

 

 

 

 

 

 

20,276

 

 

 

 

U.S. corporate debt securities

 

 

11,547

 

 

 

 

 

 

11,547

 

 

 

 

Foreign corporate debt securities

 

 

15,557

 

 

 

 

 

 

15,557

 

 

 

 

U.S. commercial paper

 

 

27,996

 

 

 

 

 

 

27,996

 

 

 

 

Foreign commercial paper

 

 

83,966

 

 

 

 

 

 

83,966

 

 

 

 

Total

 

$

208,491

 

 

$

49,149

 

 

$

159,342

 

 

$

 

 

 

 

Fair Value Measurements at Reporting Date Using

 

 

 

Balance at

December 31,

2019

 

 

Quoted

Prices in

Active

Markets for

Identical

Assets

(Level 1)

 

 

Significant

Other

Observable

Inputs

(Level 2)

 

 

Significant

Unobservable

Inputs

(Level 3)

 

Cash and money market funds

 

$

56,931

 

 

$

56,931

 

 

$

 

 

$

 

U.S. treasury bills and government agency obligations

 

 

140,626

 

 

 

140,626

 

 

 

 

 

 

 

U.S. corporate debt securities

 

 

80,170

 

 

 

 

 

 

80,170

 

 

 

 

Foreign corporate debt securities

 

 

23,203

 

 

 

 

 

 

23,203

 

 

 

 

U.S. commercial paper

 

 

32,801

 

 

 

 

 

 

32,801

 

 

 

 

Foreign commercial paper

 

 

57,241

 

 

 

 

 

 

57,241

 

 

 

 

Total

 

$

390,972

 

 

$

197,557

 

 

$

193,415

 

 

$