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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
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 and liabilities of the Company measured at fair value on a recurring basis as of December 31, 2018 and 2017:
 
Carrying
Value
 
Fair Value Measurement at December 31, 2018
 
 
Level 1
 
Level 2
 
Level 3
 
(in thousands)
Cash and cash equivalents
$
7,703

 
$
7,703

 
$
—

 
$
—

Restricted cash equivalents
500

 
500

 
—

 
—

Marketable securities—held-to-maturity:
 
 
 
 
 
 
 
Government agency bond
$
21,473

 
$
21,473

 
$
—

 
$
—

U.S. Treasury Bills
$
16,482

 
$
16,482

 
$
—

 
$
—

 Total marketable securities
$
37,955

 
$
37,955

 
$
—

 
$
—

 
 
 
 
 
 
 
 
Credit facility repayment feature liability
$
5,060

 
$
—

 
$
—

 
$
5,060

 
 
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

 
$
—

 
$
—