XML 64 R49.htm IDEA: XBRL DOCUMENT v3.10.0.1
Income Taxes - Roll Forward of Uncertain Tax Positions (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Uncertain tax positions, beginning of the year $ 0 $ 0 $ 0
Gross addition for tax positions of the current year 0 0 0
Gross additions for tax positions of prior years 2,982,337 0 0
Uncertain tax positions, end of year $ 2,982,337 $ 0 $ 0