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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2019
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 September 30, 2019 and December 31, 2018:
   
Carrying
Value
 
Fair Value Measurement at September 30, 2019
   
Level 1
 
Level 2
 
Level 3
 
(Unaudited - In thousands)
Cash and cash equivalents
$
45,039

 
$
45,039

 
$
—

 
$
—

 
 
 
 
 
 
 
 
Restricted cash
$
525

 
$
525

 
$
—

 
$
—

 
 
 
 
 
 
 
 
Marketable securities—held-to-maturity:
   

 
   

 
   

 
   

U.S. Government securities
$
—

 
$
—

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
Carrying
Value
 
Fair Value Measurement at December 31, 2018
   
Level 1
 
Level 2
 
Level 3
 
(Unaudited - In thousands)
Cash and cash equivalents
$
7,703

 
$
7,703

 
$
—

 
$
—

 
 
 
 
 
 
 
 
Restricted cash equivalents
$
500

 
$
500

 
$
—

 
$
—

 
 
 
 
 
 
 
 
Marketable securities—held-to-maturity:
   
 
 
 
 
 
 
U.S. Government securities
$
37,955

 
$
37,955

 
$
—

 
$
—

 
 
 
 
 
 
 
 
Credit facility repayment feature liability
$
5,060

 
$
—

 
$
—

 
$
5,060