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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments Remaining future minimum rental payments (excluding month to month) due under these leases are as follows:
 
Years Ending December 31, (in thousands)
2019$298 
2020118 
202197 
202244 
202335 
Thereafter15 
Total$607