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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (5,383,832) $ (7,959,349)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 942,183 744,865
Depreciation and amortization 95,680 97,419
Amortization of marketable securities discount 54,278 1,176
Net noncash lease expense 15,149 87,000
Other 10,937
Changes in operating assets and liabilities:    
Accounts receivable, net 11,227 224,096
Inventories 118,889 (638)
Prepaid expenses and other current assets 381,543 238,376
Accounts payable 31,589 (1,562,615)
Accrued expenses and other current liabilities (413,503) (262,933)
Operating lease liabilities (8,875) (108,581)
Net cash used in operating activities (4,155,672) (8,490,247)
Cash flows from investing activities:    
Purchase of marketable securities (5,082,730)
Proceeds from maturities of marketable securities 7,000,000 10,500,000
Net cash provided by investing activities 1,917,270 10,500,000
Cash flows from financing activities:    
Proceeds from shares issued 6,920,350
Net cash provided by financing activities 6,920,350
Effect of changes in exchange rates on cash and cash equivalents 140,500 46,952
Net increase in cash and cash equivalents 4,822,448 2,056,705
Cash and cash equivalents – beginning of period 4,241,937 13,563,791
Cash and cash equivalents – end of period 9,064,385 15,620,496
Supplemental cash flows disclosures:    
Interest paid 3,522 4,623
Supplemental schedule of noncash activity:    
2020 Accrued bonus awarded in equity $ 399,997