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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities      
Net loss $ (16,399,985) $ (13,227,642) $ (10,382,059)
Adjustment to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 1,494,596 1,285,902 843,387
Share-based compensation 436,691 872,177 263,396
Gain on sale of equipment (1,816) (12,133) (13,233)
Loss on asset held for sale   149,800  
Impairment loss   103,116  
Other non-cash charges 46,155   (1,364)
Changes in operating assets and liabilities:      
Other receivables 9,229 65,002 56,212
Inventory (282,260) (1,154,222) 93,956
Prepaid expenses and other assets (83,850) 59,942 289,868
Accounts payable and accrued liabilities 492,419 609,311 (966,928)
Net cash used in operating activities (14,288,821) (11,248,747) (9,816,765)
Investing activities      
Purchase of property, plant and equipment (3,975,135) (2,316,809) (4,009,736)
Deposits on equipment purchases (349,847) (160,675) (95,001)
Proceeds from sale of equipment 99,816 15,848 23,233
Proceeds from legal settlement, net 1,014,008    
Other investing activities (27,253)    
Net cash used in investing activities (3,238,411) (2,461,636) (4,081,504)
Financing activities      
Proceeds from issuance of debt 4,221,130 900,767 771,858
Payment of debt issuance costs (91,620)    
Repayment of term debt (70,826) (85,802) (55,615)
Proceeds from the issuance of common stock, net 104,625,615 12,395,348 10,616,046
Proceeds from the exercise of stock options and warrants, net 2,318,709 272,417 5,116,533
Net cash provided by financing activities 111,003,008 13,482,730 16,448,822
Effect of exchange rate changes on cash, cash equivalents and restricted cash (23,360) 23,840 (54,279)
Net change in cash, cash equivalents and restricted cash 93,452,416 (203,813) 2,496,274
Cash, cash equivalents and restricted cash at beginning of period 2,798,744 3,002,557 506,283
Cash, cash equivalents and restricted cash at end of period 96,251,160 2,798,744 3,002,557
Supplemental disclosure of cash flow information and non-cash transactions:      
Interest paid in cash 114,893 62,988 22,257
Property and equipment included in accounts payable and accrued liabilities $ 23,600 $ 210,270 193,378
Acquisition of equipment under debt arrangement     $ 74,068