Quarterly report pursuant to Section 13 or 15(d)

Income taxes (Details)

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Income taxes (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Disclosure [Abstract]        
Provision (benefit) for income taxes $ (5,931,436) $ 115,490 $ (6,541,931) $ 350,682
Effective income tax rate percent 0.10% 3.20% (43.80%) 9.40%
Release of valuation allowance $ 7,700,000   $ 1,500,000