Related Party Transactions	12 Months Ended
Dec. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS On December 12, 2012, our board of directors appointed James Tu to serve as our non-executive Chairman. On April 30, 2013, Mr. Tu became the Executive Chairman assuming the duties of the Principal Executive Officer. On October 30, 2013 Mr. Tu was appointed Executive Chairman and Chief Executive Officer by our board of directors. On May 9, 2016, Mr. Tu also assumed the role of President. On August 11, 2016, our board of directors appointed a separate Executive Chairman of the Board, and Mr. Tu continued to serve in the role of Chief Executive Officer and President, until February 19, 2017. On November 30, 2018, each of Gina Huang, Brilliant Start Enterprise, Inc. (“Brilliant Start”), Jag International Ltd., Jiangang Luo, Cleantech Global Ltd., James Tu, 5 Elements Global Fund L.P., Yeh-Mei Hui Cheng, Communal International, Ltd., and 5 Elements Energy Efficiency Limited (the “Former Schedule 13D Parties”) filed a Schedule 13D with the SEC, indicating that they may have been deemed to be a “group” under Section 13(d)(3) of the Exchange Act of 1934, as amended, and Rule 13d-5 promulgated thereunder, and that such group beneficially owned 17.6% of our common stock. The Schedule 13D was amended on February 26, 2019 and April 3, 2019. On February 21, 2019, the Former Schedule 13D Parties entered into a settlement with the Company providing for the appointment of two directors (Geraldine McManus and Jennifer Cheng) and the nomination of those two director for election at the Company’s 2019 annual meeting of stockholders. On March 29, 2019, the Company entered into a note purchase agreement (the “Note Purchase Agreement”) with certain investors, including Fusion Park LLC (of which James Tu is the sole member) (“Fusion Park”) and Brilliant Start (which is controlled by Gina Huang, a current member of our board of directors), for the purchase of an aggregate of $1.7 million of Convertible Notes. Pursuant to the Note Purchase Agreement, Fusion Park and Brilliant Start purchased $580 thousand and $500 thousand, respectively, in principal amount of Convertible Notes. In connection with the sale of Convertible Notes, Mr. Tu was appointed as a member of our board of directors on April 1, 2019 and Chief Executive Officer, President and interim Chief Financial Officer on April 2, 2019. Mr. Tu is also the Founder, Chief Executive Officer and Chief Investment Officer of 5 Elements Global Advisors, an investment advisory and management company managing the holdings of 5 Elements Global Fund LP, which was a beneficial owner of more than 5.0% of our common stock prior to the August 2014 registered offering. As of December 31, 2019, 5 Elements Global Fund LP beneficially owns approximately 2.5% of our common stock. 5 Elements Global Advisors focuses on investing in clean energy companies with breakthrough, commercialized technologies, and near-term profitability potential. Mr. Tu is also Co-Founder of Communal International Ltd. (“Communal”), a British Virgin Islands company dedicated to assisting clean energy, solutions-based companies, maximizing technology and product potential and gaining them access to global marketing, distribution licensing, manufacturing and financing resources. Communal has a 50.0% ownership interest in 5 Elements Energy Efficiencies (BVI) Ltd., a beneficial owner of approximately 2.4% of our common stock. Yeh-Mei Cheng controls 5 Elements Energy Efficiencies (BVI) Ltd. and owns the other 50.0%. She is Co-Founder of Communal International Ltd. with Mr. Tu and the mother of Simon Cheng. Mr. Cheng was a member of our board of directors through February 19, 2017 and an employee of the Company through June 30, 2018 and rejoined the Company on August 5, 2019. Yeh-Mei Cheng is also the mother of Jennifer Cheng, a current member of our board of directors.

RELATED PARTY TRANSACTIONS

On December 12, 2012, our board of directors appointed James Tu to serve as our non-executive Chairman. On April 30, 2013, Mr. Tu became the Executive Chairman assuming the duties of the Principal Executive Officer. On October 30, 2013 Mr. Tu was appointed Executive Chairman and Chief Executive Officer by our board of directors. On May 9, 2016, Mr. Tu also assumed the role of President. On August 11, 2016, our board of directors appointed a separate Executive Chairman of the Board, and Mr. Tu continued to serve in the role of Chief Executive Officer and President, until February 19, 2017.

On November 30, 2018, each of Gina Huang, Brilliant Start Enterprise, Inc. (“Brilliant Start”), Jag International Ltd., Jiangang Luo, Cleantech Global Ltd., James Tu, 5 Elements Global Fund L.P., Yeh-Mei Hui Cheng, Communal International, Ltd., and 5 Elements Energy Efficiency Limited (the “Former Schedule 13D Parties”) filed a Schedule 13D with the SEC, indicating that they may have been deemed to be a “group” under Section 13(d)(3) of the Exchange Act of 1934, as amended, and Rule 13d-5 promulgated thereunder, and that such group beneficially owned 17.6% of our common stock. The Schedule 13D was amended on February 26, 2019 and April 3, 2019.

On February 21, 2019, the Former Schedule 13D Parties entered into a settlement with the Company providing for the appointment of two directors (Geraldine McManus and Jennifer Cheng) and the nomination of those two director for election at the Company’s 2019 annual meeting of stockholders.

On March 29, 2019, the Company entered into a note purchase agreement (the “Note Purchase Agreement”) with certain investors, including Fusion Park LLC (of which James Tu is the sole member) (“Fusion Park”) and Brilliant Start (which is controlled by Gina Huang, a current member of our board of directors), for the purchase of an aggregate of $1.7 million of Convertible Notes. Pursuant to the Note Purchase Agreement, Fusion Park and Brilliant Start purchased $580 thousand and $500 thousand, respectively, in principal amount of Convertible Notes. In connection with the sale of Convertible Notes, Mr. Tu was appointed as a member of our board of directors on April 1, 2019 and Chief Executive Officer, President and interim Chief Financial Officer on April 2, 2019.

Mr. Tu is also the Founder, Chief Executive Officer and Chief Investment Officer of 5 Elements Global Advisors, an investment advisory and management company managing the holdings of 5 Elements Global Fund LP, which was a beneficial owner of more than 5.0% of our common stock prior to the August 2014 registered offering. As of December 31, 2019, 5 Elements Global Fund LP beneficially owns approximately 2.5% of our common stock. 5 Elements Global Advisors focuses on investing in clean energy companies with breakthrough, commercialized technologies, and near-term profitability potential. Mr. Tu is also Co-Founder of Communal International Ltd. (“Communal”), a British Virgin Islands company dedicated to assisting clean energy, solutions-based companies, maximizing technology and product potential and gaining them access to global marketing, distribution licensing, manufacturing and financing resources. Communal has a 50.0% ownership interest in 5 Elements Energy Efficiencies (BVI) Ltd., a beneficial owner of approximately 2.4% of our common stock. Yeh-Mei Cheng controls 5 Elements Energy Efficiencies (BVI) Ltd. and owns the other 50.0%. She is Co-Founder of Communal International Ltd. with Mr. Tu and the mother of Simon Cheng. Mr. Cheng was a member of our board of directors through February 19, 2017 and an employee of the Company through June 30, 2018 and rejoined the Company on August 5, 2019. Yeh-Mei Cheng is also the mother of Jennifer Cheng, a current member of our board of directors.