Annual report pursuant to Section 13 and 15(d)

Property and equipment - Summary of Property and Equipment (Details)

v2.4.0.8
Property and equipment - Summary of Property and Equipment (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,317,879 $ 915,649
Less: accumulated depreciation and amortization (679,853) (480,037)
Net property, plant and equipment 638,026 435,612
Minimum
    
Property, Plant and Equipment [Line Items]    
Useful life - years 3 years  
Maximum
    
Property, Plant and Equipment [Line Items]    
Useful life - years 15 years  
Machinery and Equipment
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 773,894 478,290
Machinery and Equipment | Minimum
    
Property, Plant and Equipment [Line Items]    
Useful life - years 5 years  
Machinery and Equipment | Maximum
    
Property, Plant and Equipment [Line Items]    
Useful life - years 7 years  
Furniture and Fixtures
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 79,612 54,058
Useful life - years 5 years  
Computer software
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 67,215 56,935
Computer software | Minimum
    
Property, Plant and Equipment [Line Items]    
Useful life - years 3 years  
Computer software | Maximum
    
Property, Plant and Equipment [Line Items]    
Useful life - years 5 years  
Leasehold improvements
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 397,158 [1] $ 326,366 [1]
[1] Lesser of estimated useful life of asset or lease term