Annual report pursuant to Section 13 and 15(d)

Income taxes (Reconciliation of Income Taxes) (Details)

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Income taxes (Reconciliation of Income Taxes) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Statutory federal income tax expense (benefit) $ (12,791,000) $ (7,307,000)
State taxes, net of federal tax expense (benefit) (2,887,000) (647,000)
Federal tax rate change 13,617,000
Stock compensation and other non-deductible expenses 174,000 3,118,000
Change in valuation allowance 14,805,000 (10,390,000)
Income taxes provision $ (699,000) $ (1,609,000)