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v3.10.0.1

Subsequent Events - Additional Information (Details) |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2019 USD ($) MW | Feb. 21, 2019 shares | Mar. 28, 2018 USD ($) | Jan. 31, 2019 USD ($) | Apr. 01, 2019 | Apr. 30, 2016 USD ($)
Subsequent Event [Member] | Waiver Agreement [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Percentage of shares will receive upon conversion prior to execution of waiver agreement |  | 25.00% |  |  |  |
Subsequent Event [Member] | Exchange Agreement [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Warrants exercised | shares |  | 7,680,000 |  |  |  |
Common stock issued to warrant holders | shares |  | 6,000,000 |  |  |  |
New Construction Loan Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 23,000,000 |  |  |  |  |
Loan Advance | $ 9,600,000 |  |  |  |  |
Term Loan Maturity Date | Oct. 31, 2019 |  |  |  |  |
New Construction Loan Facility [Member] | Subsequent Event [Member] | one-month LIBOR [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 2.25% |  |  |  |  |
New Construction Loan Facility [Member] | Subsequent Event [Member] | Groton CT [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Capacity of Plant | MW | 7.4 |  |  |  |  |
Hercules Capital, Inc. [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 25,000,000 |  | $ 25,000,000
Loan Advance |  |  | $ 13,100,000 |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 4.50% |  |
Term Loan Maturity Date |  |  |  | Apr. 01, 2020 |  |
Hercules Capital, Inc. [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable |  |  |  | 75.00% |  |
Hercules Capital, Inc. [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable |  |  |  |  | 75.00% |
Hercules Capital, Inc. [Member] | Subsequent Event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable | 50.00% |  |  |  |  |
Debt prepayment charge in first twelve months | 2.00% |  |  |  |  |
Debt prepayment charge thereafter | 1.00% |  |  |  |  |
Non-refundable fee paid | $ 250,000 |  |  |  |  |

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