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Subsequent Events (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
May 04, 2017
office
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
shares
Subsequent Event | Forecast        
Subsequent Event [Line Items]        
Consideration transferred       $ 1,900
Northern Hancock | Subsequent Event        
Subsequent Event [Line Items]        
Number of offices | office 2      
Northern Hancock | Subsequent Event | Forecast        
Subsequent Event [Line Items]        
Number of shares issuable (in shares) | shares       0.9793
Acquisition share price (in dollars per share) | $ / shares       $ 3.35
Corporate debt securities        
Subsequent Event [Line Items]        
Other than temporary impairment loss on investment     $ 0  
Corporate debt securities | Forecast        
Subsequent Event [Line Items]        
Other than temporary impairment loss on investment   $ 508