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Cost Method Investment (Details)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2014
USD ($)
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2017
£ / shares
Dec. 31, 2016
£ / shares
Investment [Line Items]            
Impairment charges   $ 0 $ 517      
Highview Enterprises Limited            
Investment [Line Items]            
Investment acquired, shares | shares 411,765          
Ownership interest, percent 8.00%          
Payments to acquire investments $ 2,800          
Highview Enterprises Limited | Cost method investment            
Investment [Line Items]            
Impairment charges       $ 1,800    
Share price, estimated fair value (per shares) | £ / shares         £ 2.00 £ 2.00
Share price (in dollars per shares) | £ / shares           £ 4.25