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Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities    
Net loss $ (5,230,936) $ (4,149,179)
Adjustment to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 273,646 91,569
Share-based compensation 120,089 48,752
Gain on disposal of equipment (11,745) 0
Changes in operating assets and liabilities:    
Other receivables 77,782 7,853
Inventory 88,656 (78,275)
Prepaid expenses and other assets 131,486 (279,058)
Accounts payable and accrued liabilities (783,356) (38,702)
Net cash used in operating activities (5,334,378) (4,397,040)
Investing activities    
Purchase of property, plant and equipment (3,039,177) (16,193,926)
Proceeds on sale of equipment 21,745 0
Net cash used in investing activities (3,017,432) (16,193,926)
Financing activities    
Proceeds from issuance of debt 0 256,807
Repayment of term debt (28,870) (11,405)
Proceeds from the issuance of common stock and warrants, net 10,616,048 24,989,257
Proceeds from the exercise of stock options and warrants 811,928 27,502
Net cash provided by financing activities 11,399,106 25,262,161
Effect of exchange rate changes on cash and cash equivalents (21,351) (4,422)
Net change in cash and cash equivalents 3,025,945 4,666,773
Cash and cash equivalents at beginning of period 492,861 3,324,609
Cash and cash equivalents at the end of period 3,518,806 7,991,382
Supplemental disclosure of cash flow information and non-cash transactions:    
Interest paid in cash 10,685 10,533
Property and equipment included in accounts payable and accrued liabilities 330,136 16,218
Acquisition of equipment under debt agreement $ 75,124 $ 0