Long-Term Loans, Related Party	3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]
Long-Term Loans, Related Party	Long-Term Loans, Related Party Kien Huat Montreign Loan Agreement and Kien Huat Note Exchange Agreement On January 24, 2017, Kien Huat and Montreign Holding entered into a loan agreement (the “Kien Huat Montreign Loan Agreement”), pursuant to which Montreign Holding obtained from Kien Huat a loan in the principal amount of $32.3 million (the "Kien Huat Montreign Loan"), the net proceeds of which were used as a capital contribution to Montreign Operating for use towards the expenses of the Development Projects. The obligations of Montreign Holding under the Kien Huat Montreign Loan Agreement were secured by a pledge of all the membership interests of Montreign Holding by Empire. Concurrently with and as a condition to the closing of the Bangkok Bank Loan Agreement, on December 28, 2017, Empire, Montreign Holding, and Kien Huat entered into a Note Exchange Agreement (the “Kien Huat Note Exchange Agreement”). The Kien Huat Note Exchange Agreement provided for the issuance of 1,379,873 shares of common stock (the “Exchange Shares”) to Kien Huat in full satisfaction of the Kien Huat Montreign Loan. On December 28, 2017, total indebtedness outstanding under the Kien Huat Montreign Loan was $36.2 million. Such total indebtedness outstanding under the Kien Huat Montreign Loan was exchanged for the Exchange Shares at an exchange rate of $26.21, which exchange rate represents the volume-weighted average price of the Company’s common stock for the 30-day period immediately preceding the date on which the Kien Huat Note Exchange Agreement was executed. In connection with the satisfaction in full of the Kien Huat Montreign Loan pursuant to the Kien Huat Note Exchange Agreement, Empire's pledge of its membership interests in Montreign Holding was released. The Exchange Shares were issued pursuant to an exemption from the registration requirement of the Securities Act provided in Section 4(a)(2) of the Securities Act. Kien Huat Backstop Loan Agreement On December 28, 2017, Empire and Kien Huat entered into a loan agreement (the "Kien Huat Backstop Loan Agreement"), providing for loans to Empire in an aggregate principal amount of up to $20 million. Any amounts borrowed pursuant to the Kien Huat Backstop Loan Agreement will be used exclusively to make payments required under the Bangkok Bank Loan Agreement and will mature on the one-year anniversary of the maturity date of the Bangkok Bank Loan, or such earlier date that the Bangkok Bank Loan is terminated. At March 31, 2018, there were no outstanding borrowings pursuant to the Kien Huat Backstop Loan Agreement. The Kien Huat Backstop Loan Agreement contains representations and warranties and affirmative covenants that are usual and customary, including representations, warranties and covenants that restrict the Company’s use of the proceeds of any loans made pursuant to the Kien Huat Backstop Loan Agreement to pay amounts due and payable under the Bangkok Bank Loan. Obligations under the Kien Huat Backstop Loan Agreement may be accelerated upon certain customary events of default (subject to grace periods, as appropriate), including among others, nonpayment of principal, interest or fees, and breach of the affirmative covenants.

Long-Term Loans, Related Party

Kien Huat Montreign Loan Agreement and Kien Huat Note Exchange Agreement

On January 24, 2017, Kien Huat and Montreign Holding entered into a loan agreement (the “Kien Huat Montreign Loan Agreement”), pursuant to which Montreign Holding obtained from Kien Huat a loan in the principal amount of $32.3 million (the "Kien Huat Montreign Loan"), the net proceeds of which were used as a capital contribution to Montreign Operating for use towards the expenses of the Development Projects. The obligations of Montreign Holding under the Kien Huat Montreign Loan Agreement were secured by a pledge of all the membership interests of Montreign Holding by Empire.

Concurrently with and as a condition to the closing of the Bangkok Bank Loan Agreement, on December 28, 2017, Empire, Montreign Holding, and Kien Huat entered into a Note Exchange Agreement (the “Kien Huat Note Exchange Agreement”). The Kien Huat Note Exchange Agreement provided for the issuance of 1,379,873 shares of common stock (the “Exchange Shares”) to Kien Huat in full satisfaction of the Kien Huat Montreign Loan. On December 28, 2017, total indebtedness outstanding under the Kien Huat Montreign Loan was $36.2 million. Such total indebtedness outstanding under the Kien Huat Montreign Loan was exchanged for the Exchange Shares at an exchange rate of $26.21, which exchange rate represents the volume-weighted average price of the Company’s common stock for the 30-day period immediately preceding the date on which the Kien Huat Note Exchange Agreement was executed. In connection with the satisfaction in full of the Kien Huat Montreign Loan pursuant to the Kien Huat Note Exchange Agreement, Empire's pledge of its membership interests in Montreign Holding was released. The Exchange Shares were issued pursuant to an exemption from the registration requirement of the Securities Act provided in Section 4(a)(2) of the Securities Act.

Kien Huat Backstop Loan Agreement

On December 28, 2017, Empire and Kien Huat entered into a loan agreement (the "Kien Huat Backstop Loan Agreement"), providing for loans to Empire in an aggregate principal amount of up to $20 million. Any amounts borrowed pursuant to the Kien Huat Backstop Loan Agreement will be used exclusively to make payments required under the Bangkok Bank Loan Agreement and will mature on the one-year anniversary of the maturity date of the Bangkok Bank Loan, or such earlier date that the Bangkok Bank Loan is terminated. At March 31, 2018, there were no outstanding borrowings pursuant to the Kien Huat Backstop Loan Agreement.

The Kien Huat Backstop Loan Agreement contains representations and warranties and affirmative covenants that are usual and customary, including representations, warranties and covenants that restrict the Company’s use of the proceeds of any loans made pursuant to the Kien Huat Backstop Loan Agreement to pay amounts due and payable under the Bangkok Bank Loan. Obligations under the Kien Huat Backstop Loan Agreement may be accelerated upon certain customary events of default (subject to grace periods, as appropriate), including among others, nonpayment of principal, interest or fees, and breach of the affirmative covenants.