Quarterly report pursuant to Section 13 or 15(d)

Stockholders' equity (Details)

XML 62 R52.htm IDEA: XBRL DOCUMENT v3.4.0.3
Stockholders' equity (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
Feb. 09, 2016
USD ($)
shares
Mar. 31, 2016
$ / shares
shares
Jan. 19, 2016
$ / shares
shares
Jan. 15, 2016
Dec. 31, 2015
$ / shares
shares
Equity [Abstract]          
Common stock, shares authorized (in shares)   75,000,000     75,000,000
Common stock, par value per share (in dollars per share) | $ / shares   $ 0.0001     $ 0.0001
Preferred stock, shares authorized (in shares)   10,000,000     10,000,000
Preferred stock, par value per share (in dollars per share) | $ / shares   $ 0.0001     $ 0.0001
Common stock, shares outstanding (in shares)   24,989,560     24,972,515
Preferred stock, shares outstanding (in shares)   0     0
Class of Stock [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 (in dollars per share) | $ / 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 in rights offering 1,454,545        
Number of shares issued for basic subscription rights from rights offering 632,582        
Net proceeds form issuance of stock from rights offering | $ $ 3.8        
Initial Stockholders          
Class of Stock [Line Items]          
Shares of stock forfeited   1,437,500