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Subsequent Events - Additional Information (Details) $ / shares in Units, $ in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Sep. 05, 2017 USD ($) $ / shares shares | Aug. 29, 2017 USD ($) MW | Jul. 31, 2017
Subsequent Event [Line Items] |  |  |
Stockholders' equity, reverse stock split |  |  | 1-for-12
Hercules Capital, Inc. [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt Instrument, Covenant Description |  |  | The loan contains a financial covenant whereby the Company is required to maintain an unrestricted cash balance of at least (a) 75% of the outstanding Loan balance plus (b) the amount of accounts payable (as defined under GAAP) not paid within 90 days of the date payment was issued.
Series C Preferred Stock [Member] | Convertible Preferred Offering [Member] | Hercules Capital, Inc. [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt Instrument, Covenant Description |  |  | to require us to maintain an unrestricted blocked cash balance of at least the greater of (x) (a) $20.0 million plus (b) the amount of accounts payable not paid within 90 days of the date payment was issued and (y) (a) 100% of the outstanding loan balance plus (b) the amount of accounts payable not paid within 90 days of the date payment was issued
Subsequent Event [Member] | Series C Preferred Stock [Member] | Convertible Preferred Offering [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Underwritten offering of convertible preferred stock | shares | 33,500 |  |
Preferred stock dividend rate | 0.00% |  |
Conversion of stock conversion price | $ / shares | $ 1.84 |  |
Stock price per share | $ / shares | $ 895.52 |  |
Gross proceeds from sale of preferred stock | $ 30.0 |  |
Offering closed date | Sep. 08, 2017 |  |
Subsequent Event [Member] | Series C Preferred Stock [Member] | Convertible Preferred Offering [Member] | Hercules Capital, Inc. [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Minimum unrestricted blocked cash balance | $ 20.0 |  |
Subsequent Event [Member] | Hanyang Industrial Development Company Ltd. [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Contract to sell fuel cell plants | MW |  | 20 |
Project represent in excess of product revenue |  | $ 60.0 |

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- Definition Contract to sell fuel cell plants. + References No definition available. + Details
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- Definition Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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