Annual report pursuant to Section 13 and 15(d)

Subsequent events (Details)

v3.3.1.900
Subsequent events (Details)
$ / shares in Units, $ in Millions
 1 Months Ended
Feb. 27, 2016
$ / shares
shares
Oct. 16, 2013
shares
Feb. 09, 2016
USD ($)
shares
Jan. 19, 2016
$ / shares
shares
Jan. 15, 2016
Dec. 31, 2015
shares
Dec. 31, 2014
shares
Oct. 15, 2013
shares
Subsequent Event [Line Items]                
Common stock, shares outstanding           24,972,515 24,940,195  
Initial Stockholders [Member]                
Subsequent Event [Line Items]                
Shares forfeited   3,375,000            
Common stock, shares outstanding   9,125,000           12,500,000
Subsequent Event [Member]                
Subsequent Event [Line Items]                
Maximum number of shares available for purchase for rights offering       1,454,545        
Rights conversion ratio into shares for rights offering       1        
Exercise price per share for rights offering | $ / shares       $ 2.75        
Rights conversion ratio from common stock owned for rights offering         0.0582      
Gross proceeds from issuance of stock from rights offering | $     $ 4.0          
Number of shares issued from rights offering     1,454,545          
Number of shares issued for basic subscription rights from rights offering     632,582          
Net proceeds from issuance of stock from rights offering | $     $ 3.8          
Number of warrants expired 5,750,000              
conversion ratio of warrants 1              
Exercise price of warrants (in dollars per warrant) | $ / shares $ 5.00              
Common stock, shares outstanding 24,989,560              
Subsequent Event [Member] | Initial Stockholders [Member]                
Subsequent Event [Line Items]                
Shares forfeited 1,437,500