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Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Investments [Abstract]  
Amortized Cost and Estimated Fair Value of Investments Held to Maturity
The following summarizes the amortized cost and estimated fair value of our investments held to maturity as of June 30, 2018 and December 31, 2017:
 
 
Amortized
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
(Loss)
 
Fair
Value
 (Level 1)
June 30, 2018:
(in thousands)
Current assets:
 
 
 
 
 
 
 
 Investments held to maturity
$
2,955

 
$
—

 
$
(3
)
 
$
2,952

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
—

 
—

 
—

 
—

Total
$
2,955

 
$
—

 
$
(3
)
 
$
2,952

 
 
 
 
 
 
 
 
December 31, 2017:
 

 
 

 
 

 
 

Current assets:
 

 
 

 
 

 
 

Investments held to maturity
$
6,077

 
$
—

 
$
(6
)
 
$
6,071

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
—

 
—

 
—

 
—

Total
$
6,077

 
$
—

 
$
(6
)
 
$
6,071