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Investments
 6 Months Ended
Jun. 30, 2017
Investments Debt And Equity Securities [Abstract]  
Investments

4.

Investments

As of June 30, 2017 and December 31, 2016, the fair value of available-for-sale investments by type of security was as follows:

 

 

 

June 30, 2017

 

 

 

Amortized

Cost

 

 

Gross

Unrealized Gain

 

 

Gross

Unrealized Loss

 

 

Fair

Value

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Commercial Paper

 

$

16,705

 

 

$

—

 

 

$

(6

)

 

$

16,699

 

Certificates of Deposit

 

 

8,174

 

 

 

—

 

 

 

—

 

 

 

8,174

 

Corporate Bonds

 

 

74,261

 

 

 

—

 

 

 

(87

)

 

 

74,174

 

Government Securities

 

 

26,500

 

 

 

—

 

 

 

(69

)

 

 

26,431

 

Treasury Bonds

 

 

16,067

 

 

 

—

 

 

 

(13

)

 

 

16,054

 

 

 

$

141,707

 

 

$

—

 

 

$

(175

)

 

$

141,532

 

 

 

 

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

 

 

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.