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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2019
Investments Debt And Equity Securities [Abstract]  
Summary of the Investments

The following table summarizes the Company’s investments:

 

 

 

September 30, 2019

 

 

December 31, 2018

 

 

 

Amortized

Cost

 

 

Unrealized

Gain

 

 

Unrealized

(Loss)

 

 

Estimated

Fair Value

 

 

Amortized

Cost

 

 

Unrealized

Gain

 

 

Unrealized

(Loss)

 

 

Estimated

Fair Value

 

Commercial Paper

 

$

19,862

 

 

$

38

 

 

$

—

 

 

$

19,900

 

 

$

36,235

 

 

$

49

 

 

$

(1

)

 

$

36,283

 

Corporate Debt Securities

 

 

111,240

 

 

 

167

 

 

 

(7

)

 

$

111,400

 

 

 

159,348

 

 

 

5

 

 

 

(238

)

 

 

159,115

 

Government and Agency Securities

 

 

54,070

 

 

 

32

 

 

 

(7

)

 

 

54,095

 

 

 

25,764

 

 

 

—

 

 

 

(14

)

 

 

25,750

 

Total

 

$

185,172

 

 

$

237

 

 

$

(14

)

 

$

185,395

 

 

$

221,347

 

 

$

54

 

 

$

(253

)

 

$

221,148