Related Party Transactions	12 Months Ended
Dec. 31, 2017
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 the 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. 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 percent of our common stock prior to the August 2014 registered offering. As of December 31, 2017, 5 Elements Global Fund LP holds approximately 2.5 percent 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 percent ownership interest in 5 Elements Energy Efficiencies (BVI) Ltd., a beneficial owner of approximately 2.4 percent of our common stock. Yeh-Mei Cheng controls 5 Elements Energy Efficiencies (BVI) Ltd. and owns the other 50 percent. She is Co-Founder of Communal International Ltd. with Mr. Tu and the mother of Simon Cheng, a member of our Board of Directors through February 19, 2017 and an employee of the Company. On February 27, 2012, we entered into an Asian Business Development/Collaboration Agreement with Communal. The agreement had a term of 60 months, under which we paid $523 thousand to Communal in 2012. Effective January 1, 2013, the Asian Business Development/Collaboration Agreement with Communal was amended to reflect the extension of the terms of the Agreement for an additional twelve months, and the addition of certain services and countries in the territory covered by the Agreement. In connection with the amended and restated Agreement, we paid an additional $425 thousand in 2013 and recorded expense of $226 thousand. For the year ended December 31, 2015, nothing was paid under this Agreement and we recorded expense of $226 thousand per year. On December 23, 2015, we terminated the Agreement with Communal without penalty.

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 the 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.

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 percent of our common stock prior to the August 2014 registered offering. As of December 31, 2017, 5 Elements Global Fund LP holds approximately 2.5 percent 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 percent ownership interest in 5 Elements Energy Efficiencies (BVI) Ltd., a beneficial owner of approximately 2.4 percent of our common stock. Yeh-Mei Cheng controls 5 Elements Energy Efficiencies (BVI) Ltd. and owns the other 50 percent. She is Co-Founder of Communal International Ltd. with Mr. Tu and the mother of Simon Cheng, a member of our Board of Directors through February 19, 2017 and an employee of the Company.

On February 27, 2012, we entered into an Asian Business Development/Collaboration Agreement with Communal. The agreement had a term of 60 months, under which we paid $523 thousand to Communal in 2012. Effective January 1, 2013, the Asian Business Development/Collaboration Agreement with Communal was amended to reflect the extension of the terms of the Agreement for an additional twelve months, and the addition of certain services and countries in the territory covered by the Agreement. In connection with the amended and restated Agreement, we paid an additional $425 thousand in 2013 and recorded expense of $226 thousand. For the year ended December 31, 2015, nothing was paid under this Agreement and we recorded expense of $226 thousand per year. On December 23, 2015, we terminated the Agreement with Communal without penalty.