Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Minimum Rental Payments (Details)

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Commitments and Contingencies - Minimum Rental Payments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Estimated future minimum rental payments on the leases      
2019 $ 1,866    
2020 2,540    
2021 3,970    
2022 2,518    
2023 2,574    
Thereafter 30,111    
TOTAL 43,579    
Total rent expense $ 484 $ 494 $ 433