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Commitments and Contingencies - Future Minimum Lease Payments Under Non-cancelable Operating Leases (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Future minimum lease payments under non-cancelable operating leases  
2016 $ 353
2017 349
2018 300
2019 2
2020 and thereafter 1
Total minimum lease payments $ 1,005