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Short-term Investments (Tables)
 9 Months Ended
Sep. 30, 2018
Investments Debt And Equity Securities [Abstract]  
Summary of Major Security Type of Investments

The following table summarizes, by major security type, the Company’s investments (in thousands):

 

 

As of September 30, 2018:

 

Amortized Cost

 

 

Gross Unrealized Gains

 

 

Gross Unrealized Losses

 

 

Fair Value

 

Short-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government securities

 

$

11,992

 

 

$

—

 

 

$

(7

)

 

$

11,985

 

Asset backed securities

 

 

9,484

 

 

 

—

 

 

 

(4

)

 

 

9,480

 

Corporate securities

 

 

19,090

 

 

 

—

 

 

 

(10

)

 

 

19,080

 

Commercial paper

 

 

46,556

 

 

 

1

 

 

 

—

 

 

 

46,557

 

Total short-term investments

 

$

87,122

 

 

$

1

 

 

$

(21

)

 

$

87,102

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

As of December 31, 2017:

 

Amortized Cost

 

 

Gross Unrealized Gains

 

 

Gross Unrealized Losses

 

 

Fair Value

 

Short-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government securities

 

$

11,894

 

 

$

—

 

 

$

(9

)

 

$

11,885

 

Asset backed securities

 

 

8,389

 

 

 

—

 

 

 

(6

)

 

 

8,383

 

Corporate securities

 

 

22,113

 

 

 

—

 

 

 

(31

)

 

 

22,082

 

Commercial paper

 

 

29,842

 

 

 

—

 

 

 

—

 

 

 

29,842

 

Total short-term investments

 

$

72,238

 

 

$

—

 

 

$

(46

)

 

$

72,192