Annual report pursuant to Section 13 and 15(d)

Business and summary of significant accounting policies - Income taxes and advertising expense (Details)

v3.3.1.900
Business and summary of significant accounting policies - Income taxes and advertising expense (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Decrease in valuation allowance $ 7,700,000   $ (2,542,278)
Unrecognized tax benefits   $ 0 0
Advertising expense   $ 2,400,000 $ 1,700,000