Annual report pursuant to Section 13 and 15(d)

Stockholders' equity - Common Stock and Receivable from Shareholder (Details)

v3.8.0.1
Stockholders' equity - Common Stock and Receivable from Shareholder (Details)
1 Months Ended
May 18, 2017
shares
Apr. 13, 2016
May 03, 2016
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Apr. 30, 2016
Feb. 13, 2013
shares
Class of Stock [Line Items]              
Conversion ratio of restricted Ilios shares to Company common shares   7.86          
Shares issued in acquisition (shares) 4,662,937            
Common stock, shares outstanding       24,766,892 19,981,912    
Preferred stock, shares authorized             10,000,000
Private Placement | Common stock              
Class of Stock [Line Items]              
Shares issued in exchange for Ilios shares (shares)     670,464        
Percentage of voting interests acquired (percent)           100.00%  
American DG Energy              
Class of Stock [Line Items]              
Outstanding common shares acquired (percent) 100.00%