Quarterly report pursuant to Section 13 or 15(d)

Subsequent events (Details)

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Subsequent events (Details) - Subsequent Event - $ / shares
Apr. 08, 2016
Apr. 01, 2016
Subsequent Event [Line Items]    
Options issued 1,000,000 250,000
Award exercise price $ 2.73 $ 2.83
Stock Options    
Subsequent Event [Line Items]    
Contractual term 10 years 10 years
Award vesting period 5 years 5 years
Restricted Stock Units    
Subsequent Event [Line Items]    
Contractual term 10 years  
Award vesting period 5 years  
Awards issued 787,500