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Investments
 12 Months Ended
Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]  
Investments

4.

Investments

As of December 31, 2018 the Company had no investments.  As of December 31, 2017, the fair value of available-for-sale investments by type of security was as follows:

 

 

 

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

 

 

 

—

 

 

 

(31

)

 

 

16,961

 

 

 

$

114,040

 

 

$

—

 

 

$

(146

)

 

$

113,894

 

 

 

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.

 

Excluded from the table above are restricted investments of $1,400 as the cost approximates current fair value.