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Investments
 12 Months Ended
Dec. 31, 2017
Investments [Abstract]  
Investments

4. INVESTMENTS

Investments as of December 31, 2017 consisted of the following:







 

 

 

 

 

 

 

 

 



 

 

 

 

 

 

 

 

 



 

 

 

 

Unrealized

 

 

 



 

 

 

 

Gains

 

 

 



 

Cost Basis

 

(Losses)

 

Fair Value

Corporate bonds

 

$

 2,925 

 

$

 (5)

 

$

 2,920 

U.S. government agencies and securities

 

 

 3,000 

 

 

 (1)

 

 

 2,999 

Commercial paper

 

 

 6,723 

 

 

 —

 

 

 6,723 

Total

 

$

 12,648 

 

$

 (6)

 

$

 12,642 



Investments as of December 31, 2016 consisted of the following:







 

 

 

 

 

 

 

 

 



 

 

 

 

 

 

 

 

 



 

 

 

 

Unrealized

 

 

 



 

 

 

 

Gains

 

 

 



 

Cost Basis

 

(Losses)

 

Fair Value

Corporate bonds

 

$

 8,284 

 

$

 (8)

 

$

 8,276 

U.S. government agencies and securities

 

 

 8,542 

 

 

 (13)

 

 

 8,529 

Commercial paper

 

 

 5,996 

 

 

 —

 

 

 5,996 

Total

 

$

 22,822 

 

$

 (21)

 

$

 22,801 



The Company has not experienced any significant realized gains or losses on its investments in the periods presented in the Consolidated Statements of Operations and Comprehensive Loss. Long term investments held by the Company at December 31, 2016 had maturities between one and two years.