Annual report pursuant to Section 13 and 15(d)

Income taxes - Schedule of provision for income tax expense (Details)

v3.3.1.900
Income taxes - Schedule of provision for income tax expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Current tax expense:    
Federal $ 0 $ 110,966
State and local 533,815 361,281
Foreign 142,143 258,731
Total current tax expense 675,958 730,978
Deferred tax expense (benefit):    
Federal (7,631,243) (110,966)
State and local (2,310,424) 197,276
Foreign (50,778) 0
Total deferred tax expense (benefit) (9,992,445) 86,310
Total income tax expense (benefit) $ (9,316,487) $ 817,288