Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions Related Party Transactions (Details)

v3.7.0.1
Related Party Transactions Related Party Transactions (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2017
CNY (¥)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]          
Non-controlling Interest, Ownership Percentage by Parent     60.00% 60.00%  
Note payable to related party noncurrent   $ 15,123,000   $ 14,171,000 $ 14,053,000
Related party interest expense on note payable $ 249,000 264,000      
Swire Resources [Member]          
Related Party Transaction [Line Items]          
Related party service fees, interest expense and miscellaneous expenses 516,000 853,000      
Related party sourcing fees $ 1,000 51,000      
Note payable to related party noncurrent       $ 14,171,000  
Related party note payable maturity date Dec. 31, 2018        
Related party note payable interest rate     7.00% 7.00%  
Related party interest expense on note payable $ 249,000 264,000      
Accounts payable to related party current   $ 1,870,000   $ 1,139,000 $ 707,000
China, Yuan Renminbi | Swire Resources [Member]          
Related Party Transaction [Line Items]          
Note payable to related party noncurrent | ¥     ¥ 97,600,000