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Investments
3 Months Ended
Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]  
Investments

4.

Investments

As of March 31, 2018 and December 31, 2017, the fair value of available-for-sale investments by type of security was as follows:

 

 

 

March 31, 2018

 

 

 

Amortized

Cost

 

 

Gross

Unrealized Gain

 

 

Gross

Unrealized Loss

 

 

Fair

Value

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Commercial Paper

 

$

7,707

 

 

$

 

 

$

 

 

$

7,707

 

Certificates of Deposit

 

 

6,570

 

 

 

 

 

 

 

 

 

6,570

 

Corporate Bonds

 

 

37,849

 

 

 

 

 

 

(50

)

 

 

37,799

 

Government Securities

 

 

10,498

 

 

 

 

 

 

(22

)

 

 

10,476

 

Treasury Bonds

 

 

12,480

 

 

 

 

 

 

(32

)

 

 

12,448

 

 

 

$

75,104

 

 

$

 

 

$

(104

)

 

$

75,000

 

 

 

 

December 31, 2017

 

 

 

Amortized

Cost

 

 

Gross

Unrealized Gain

 

 

Gross

Unrealized Loss

 

 

Fair

Value

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Commercial Paper

 

$

6,198

 

 

$

 

 

$

 

 

$

6,198

 

Certificates of Deposit

 

 

8,916

 

 

 

 

 

 

 

 

 

8,916

 

Corporate Bonds

 

 

58,937

 

 

 

 

 

 

(72

)

 

 

58,865

 

Government Securities

 

 

22,997

 

 

 

 

 

 

(43

)

 

 

22,954

 

Treasury Bonds

 

 

16,992

 

 

 

 

 

 

(30

)

 

 

16,962

 

 

 

$

114,040

 

 

$

 

 

$

(145

)

 

$

113,895

 

 

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.

All investments with unrealized losses at March 31, 2018 have been in a loss position for less than 12 months or the loss is not material and temporary in nature. The Company does not intend to sell the investments that are in an unrealized loss position before recovery of their amortized cost basis.