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Investments (Tables)
 9 Months Ended
Sep. 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 September 30, 2018 and December 31, 2017:
 
 
Amortized
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
(Loss)
 
Fair
Value
 (Level 1)
September 30, 2018:
(in thousands)
Current assets:
 
 
 
 
 
 
 
 Investments held to maturity
$
1,252

 
$
—

 
$
(1
)
 
$
1,251

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
—

 
—

 
—

 
—

Total
$
1,252

 
$
—

 
$
(1
)
 
$
1,251

 
 
 
 
 
 
 
 
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