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Investments
 12 Months Ended
Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]  
Investments

4.

Investments

As of December 31, 2016 and 2015, the fair value of available-for-sale investments by type of security was as follows:

 

 

 

December 31, 2016

 

 

 

Amortized

Cost

 

 

Gross

Unrealized Gain

 

 

Gross

Unrealized Loss

 

 

Fair

Value

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Commercial Paper

 

$

19,631

 

 

$

58

 

 

$

—

 

 

$

19,689

 

Certificates of Deposit

 

 

10,629

 

 

 

—

 

 

 

—

 

 

 

10,629

 

Corporate Bonds

 

 

94,764

 

 

 

—

 

 

 

(155

)

 

 

94,609

 

Government Securities

 

 

33,513

 

 

 

—

 

 

 

(47

)

 

 

33,466

 

Treasury Bonds

 

 

17,066

 

 

 

1

 

 

 

(4

)

 

 

17,063

 

 

 

$

175,603

 

 

$

59

 

 

$

(206

)

 

$

175,456

 

 

 

 

 

December 31, 2015

 

 

 

Amortized

Cost

 

 

Gross

Unrealized Gain

 

 

Gross

Unrealized Loss

 

 

Fair

Value

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Commercial Paper

 

$

64,733

 

 

$

87

 

 

$

—

 

 

$

64,820

 

Corporate Bonds

 

 

46,538

 

 

 

—

 

 

 

(48

)

 

 

46,490

 

Government Securities

 

 

15,823

 

 

 

—

 

 

 

(4

)

 

 

15,819

 

Treasury Bonds

 

 

4,022

 

 

 

—

 

 

 

(2

)

 

 

4,020

 

 

 

$

131,116

 

 

$

87

 

 

$

(54

)

 

$

131,149

 

 

 

Investments with original maturities of less than 90 days are included in cash and cash equivalents on the consolidated balance sheets and are not included in the table above. Investments with maturities of less than 12 months are considered current and those investments with maturities greater than 12 months are considered non-current.

As of December 31, 2015, the Company’s corporate bonds, commercial paper, government securities and treasury bonds had remaining maturities of less than 12 months.