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Commitments and Contingencies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
ft²
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Operating Leases      
Area of office space leased (in square feet) | ft² 7,000    
Lease term 5 years    
Rent expense $ 163 $ 159 $ 142
Future minimum annual lease commitments under the noncancelable operating lease      
2016 162    
2017 163    
2018 169    
2019 170    
2020 $ 162