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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Scheduled Payments for the Loan Agreement

As of December 31, 2018, the scheduled payments for the loan agreement, including the scheduled final payment in 2020, were as follows (in thousands):

 

Year Ending December 31,

 

Principal

 

 

Interest and

Final Payment

 

 

Total

 

2019

 

$

556

 

 

$

845

 

 

$

1,401

 

2020

 

 

3,333

 

 

 

651

 

 

 

3,984

 

2021

 

 

3,333

 

 

 

366

 

 

 

3,699

 

2022

 

 

2,778

 

 

 

638

 

 

 

3,416

 

 

 

$

10,000

 

 

$

2,500

 

 

$

12,500