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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Carrying Value and Fair Value of Certain Financial Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table provides the carrying value and fair value of certain financial assets of the Company measured at fair value on a recurring basis as of December 31, 2017 and 2016: 
 
Carrying
Value
 
Fair Value Measurement at December 31, 2017
 
 
Level 1
 
Level 2
 
Level 3
 
(in thousands)
Cash and cash equivalents
$
20,751

 
$
20,751

 
$
—

 
$
—

Long-term restricted cash equivalents
6,336

 
6,336

 
—

 
—

Trading securities
3,761

 
3,761

 
—

 
—

Marketable securities—held-to-maturity:
 
 
 
 
 
 
 
Certificates of deposit
$
4,452

 
$
4,452

 
$
—

 
$
—

 
 
Carrying
Value
 
Fair Value Measurement at December 31, 2016
 
 
Level 1
 
Level 2
 
Level 3
 
(In thousands)
Cash and cash equivalents
$
22,058

 
$
22,058

 
$
—

 
$
—

Long-term restricted cash equivalents
6,336

 
6,336

 
—

 
—

Marketable securities—held-to-maturity:

 

 
 
 
 
Certificates of deposit
$
15,686

 
$
15,686

 
$
—

 
$
—