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Investments (Tables)
 12 Months Ended
Dec. 31, 2018
C3J [Member]  
Schedule of Investments

The following table summarizes our short term available-for-sale investments as of December 31, 2017. We did not have any available-for-sale investments as of December 31, 2018.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    

 

    

Gross

    

Gross

    

 

 

 

Amortized

 

Unrealized

 

Unrealized

 

 

 

 

Cost

 

Gains

 

Losses

 

Fair Value

December 31, 2017

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

9,658,000 

 

$

— 

 

$
(7,000)

 

$

9,651,000 

Total

 

$

9,658,000 

 

$

— 

 

$
(7,000)

 

$

9,651,000