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Subsequent events Employment Agreement (Details)
3 Months Ended
May. 06, 2016
USD ($)
$ / shares
shares
Mar. 31, 2016
shares
Apr. 04, 2016
ft²
Nov. 30, 2015
ft²
Jun. 11, 2015
ft²
Subsequent Event [Line Items]          
Area of Land | ft²       2,300 22,600
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Area of Land | ft²     3,500    
Chief Executive Officer | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Officers' Compensation | $ $ 475,000        
Officers' Compensation, Maximum Bonus as a Percentage of Base Compensation 50.00%        
Supplemental Unemployment Benefits, Severance Payment Period 24 months        
Share-based Compensation Award, Tranche One | Chief Executive Officer | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 750,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price | $ / shares $ 4.73        
Stock options          
Subsequent Event [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares   2,091,950      
Stock options | Chief Executive Officer | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years