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Related-Party Transactions (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Related party balances and activity      
Accounts payable to affiliates $ 204,000   $ 145,000
Services rendered and rent for office space provided      
Related party balances and activity      
Amounts allocated for services rendered and rent for office space $ 762,000 $ 431,000  
Affiliated Entity | Services rendered and rent for office space provided      
Related party balances and activity      
General payment period 30 days    
Accounts receivable from affiliates $ 0