Long-Term Debt	6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]
Long-Term Debt	7. Long-Term Debt NY Green Bank Loan On December 23, 2016, the Company, and its subsidiaries Emerging Power Inc. and Emergent Power Inc. entered into a loan and security agreement with NY Green Bank, a Division of the New York State Energy Research & Development Authority (NY Green Bank), pursuant to which NY Green Bank made available to the Company a secured term loan facility in the amount of $25.0 million (Term Loan Facility), subject to certain terms and conditions. The Company borrowed $25.0 million upon closing and incurred costs of $1.2 million. At June 30, 2017, the outstanding principal balance under the Term Loan Facility was $23.8 million. The fair value of the Term Loan Facility approximates the carrying value as of June 30, 2017. During July 2017, the Company and NY Green Bank announced an amendment to the Term Loan Facility, as described in Note 14, Subsequent Events. The amendment provided an additional $20.0 million of working capital financing. Advances under the Term Loan Facility bear interest at a rate equal to the sum of (i) the LIBOR rate for the applicable interest period, plus (ii) the credit default swap index coupon for the applicable interest period, plus (iii) 6.00% per annum. The interest rate at June 30, 2017 was approximately 11.2%. The term of the loan is three years, with a maturity date of December 23, 2019. As of June 30, 2017, and prior to the amendment mentioned above, estimated remaining principal payments will approximately be $4.8 million, $9.0 million, and $10.0 million during the years ended December 31, 2017, 2018, and 2019, respectively. These payments will be funded by restricted cash released, as described in Note 13, Commitments and Contingencies. Interest and a varying portion of the principal amount is payable on a quarterly basis and the entire then outstanding principal balance of the Term Loan Facility, together with all accrued and unpaid interest, is due and payable on the maturity date. On the maturity date, the Company may also be required to pay additional fees of up to $1.8 million if the Company is unable to meet certain goals related to the deployment of fuel cell systems in the State of New York and increasing the Company’s number of full-time employees in the State of New York. The Company is currently on track to meet those goals.

7. Long-Term Debt

NY Green Bank Loan

On December 23, 2016, the Company, and its subsidiaries Emerging Power Inc. and Emergent Power Inc. entered into a loan and security agreement with NY Green Bank, a Division of the New York State Energy Research & Development Authority (NY Green Bank), pursuant to which NY Green Bank made available to the Company a secured term loan facility in the amount of $25.0 million (Term Loan Facility), subject to certain terms and conditions. The Company borrowed $25.0 million upon closing and incurred costs of $1.2 million. At June 30, 2017, the outstanding principal balance under the Term Loan Facility was $23.8 million. The fair value of the Term Loan Facility approximates the carrying value as of June 30, 2017. During July 2017, the Company and NY Green Bank announced an amendment to the Term Loan Facility, as described in Note 14, Subsequent Events. The amendment provided an additional $20.0 million of working capital financing.

Advances under the Term Loan Facility bear interest at a rate equal to the sum of (i) the LIBOR rate for the applicable interest period, plus (ii) the credit default swap index coupon for the applicable interest period, plus (iii) 6.00% per annum. The interest rate at June 30, 2017 was approximately 11.2%. The term of the loan is three years, with a maturity date of December 23, 2019. As of June 30, 2017, and prior to the amendment mentioned above, estimated remaining principal payments will approximately be $4.8 million, $9.0 million, and $10.0 million during the years ended December 31, 2017, 2018, and 2019, respectively. These payments will be funded by restricted cash released, as described in Note 13, Commitments and Contingencies.

Interest and a varying portion of the principal amount is payable on a quarterly basis and the entire then outstanding principal balance of the Term Loan Facility, together with all accrued and unpaid interest, is due and payable on the maturity date. On the maturity date, the Company may also be required to pay additional fees of up to $1.8 million if the Company is unable to meet certain goals related to the deployment of fuel cell systems in the State of New York and increasing the Company’s number of full-time employees in the State of New York. The Company is currently on track to meet those goals.