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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2020
Summary of Significant Accounting Policies  
Summary of contract liabilities

 

 

 

 

 

 

 

 

 

June 30, 

 

December 31, 

(in thousands)

    

2020

    

2019

Contract liabilities

 

$

(135)

 

$

(451)