Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Stockholders' equity - Common Stock and Receivable from Shareholder (Details)
 1 Months Ended 12 Months Ended 24 Months Ended
Apr. 13, 2016
May 03, 2016
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2015
$ / shares
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            
Common stock, shares outstanding     18,478,990 18,478,990 19,981,912    
Preferred stock, shares authorized             10,000,000
Private Placement | Common stock              
Class of Stock [Line Items]              
Shares of common stock issued in private placements     2,350,734        
Net cash proceeds from private placements | $     $ 8,859,767        
Shares issued in exchange for Ilios shares (shares)   670,464          
Percentage of voting interests acquired (percent)           100.00%  
Private Placement | Common stock | Minimum              
Class of Stock [Line Items]              
Private placements, price in usd per share | $ / shares       $ 3.37      
Private Placement | Common stock | Maximum              
Class of Stock [Line Items]              
Private placements, price in usd per share | $ / shares       $ 4.75