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Long-Term Debt - Bankok Bank Loan (Details) - Bangkok Bank Loan [Member] - USD ($)
$ in Millions
Dec. 28, 2017
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Stated percentage   8.65% 8.77%
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 6.25%    
Base Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 5.25%    
Line of Credit [Member]      
Debt Instrument [Line Items]      
Long-term Line of Credit   $ 20 $ 20