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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Long-term debt and lease financing obligations
Long-term debt and lease financing obligations consisted of the following at December 31 (in thousands):
 
2017
 
2016
Term loans payable
$
49,315

 
$
47,844

Lease financing obligations
—

 
58

Total long-term debt and lease financing obligations
49,315


47,902

Unamortized debt issuance costs
(384
)
 
(478
)
Current portion of lease financing obligations
—

 
(58
)
Long-term debt and lease financing obligations, net of debt issuance costs and current portion
$
48,931


$
47,366
Scheduled Future Payments of Principal for Outstanding Debt and Lease Financing Obligations
Scheduled future payments of principal for outstanding debt and lease financing obligations were as follows at December 31:
2018
$
—

2019
—

2020
—

2021
36,987

2022
12,328

 
$
49,315