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Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Sep. 04, 2015
Jun. 30, 2015
Dec. 31, 2014
Cash and Cash Equivalents [Line Items]          
Total cash and cash equivalents $ 49,445 $ 52,966   $ 82,162 $ 112,521
Restricted Cash [Abstract]          
Restricted cash 4,623 4,623      
Surety Bond [Member]          
Restricted Cash [Abstract]          
Restricted cash     $ 4,600    
United States [Member]          
Cash and Cash Equivalents [Line Items]          
Total cash and cash equivalents 6,553 8,458      
People's Republic of China [Member]          
Cash and Cash Equivalents [Line Items]          
Total cash and cash equivalents 22,366 28,681      
Asia [Member]          
Cash and Cash Equivalents [Line Items]          
Total cash and cash equivalents 4,455 5,346      
Europe [Member]          
Cash and Cash Equivalents [Line Items]          
Total cash and cash equivalents 11,729 8,093      
South America [Member]          
Cash and Cash Equivalents [Line Items]          
Total cash and cash equivalents $ 4,342 $ 2,388