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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Long-term debt and lease financing obligations
Long-term debt consisted of the following at December 31 (in thousands):
 
2019
 
2018
Borrowings under term loan agreements
$
80,000

 
$
60,000

Paid in-kind interest on term loan agreements
2,593

 
400

Unamortized debt discounts
(2,642
)
 
(2,004
)
Long-term debt, net of discounts
$
79,951


$
58,396
Scheduled Future Payments of Principal for Outstanding Debt and Lease Financing Obligations
Scheduled future payments of principal for outstanding debt were as follows at December 31:
2020
$
—

2021
—

2022
—

2023
—

2024
82,593

 
$
82,593