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Income taxes - Reconciliation of Tax Rate (Details)
12 Months Ended
Dec. 21, 2017
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Income taxes        
U.S. Statutory Tax Rate 35.00% 21.00% 21.00% 34.00%
Change in Valuation Allowance   (21.50%)   44.00%
Deferred Tax Adjustments   0.00%   (47.00%)
Federal Rate Change   0.00%   (31.00%)
State tax expense, net   1.80%   2.00%
Provision to Return and Other Adjustments   (1.30%)   (2.00%)
Tax Expense / (Benefit)   0.00%   0.00%