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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015: 
 
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

 
$
—

 
$
—

Total marketable securities
$
15,686

 
$
15,686

 
$
—

 
$
—

 
 
Carrying
Value
 
Fair Value Measurement at December 31, 2015
 
 
Level 1
 
Level 2
 
Level 3
 
(In thousands)
Cash and cash equivalents
$
32,838

 
$
32,838

 
$
—

 
$
—

Marketable securities—held-to-maturity:

 

 
 
 
 
Government agency bonds
$
1,329

 
$
1,329

 
$
—

 
$
—

Certificates of deposit
39,434

 
39,434

 
—

 
—

Total marketable securities
$
40,763

 
$
40,763

 
$
—

 
$
—