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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [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 at December 31, 2017 and December 31, 2016:
 
 
Amortized
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
(Loss)
 
Fair
Value
December 31, 2017:
(in thousands)
Current assets:
 

 
 

 
 

 
 

 Investments held to maturity
$
6,077

 
$
—

 
$
(6
)
 
$
6,071

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
—

 
—

 
—

 
—

Total
$
6,077

 
$
—

 
$
(6
)
 
$
6,071

December 31, 2016:
 

 
 

 
 

 
 

Current assets:
 

 
 

 
 

 
 

Investments held to maturity
$
14,083

 
$
—

 
$
(12
)
 
$
14,071

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
—

 
—

 
—

 
—

Total
$
14,083

 
$
—

 
$
(12
)
 
$
14,071
Estimated Useful Lives
Depreciation is computed using the straight-line method over the following estimated useful lives:

Buildings
3-40 years
Machinery and equipment
3-15 years
Furniture and fixtures
3-7 years