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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 $ (18,379,941) $ (19,245,230)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,229,628 788,838
Loss on disposal of fixed assets 781 976
Stock-based compensation 781,397 676,548
Amortization of debt discount 443,794 429,711
Amortization of license revenue (35,708) (35,708)
Changes in operating assets and liabilities:    
Accounts receivable (2,124,740) (3,637,915)
Inventories (12,610,601) 775,932
Prepaid expenses and other current assets (2,756,142) (2,321,751)
Deposits and other assets 19,718 (79,532)
Accounts payable 1,079,144 (22,356)
Accrued expenses (843,043) (1,930,591)
Other current and non-current liabilities (33,413) (45,882)
Net cash used in operating activities (33,229,126) (24,646,960)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (2,571,161) (2,074,876)
Proceeds from the sale of property and equipment 0 2,000
Net cash used in investing activities (2,571,161) (2,072,876)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock, net of offering expenses 41,912,515 88,704,039
Proceeds from the exercise of stock options 0 7,177
Taxes paid on vested Restricted Stock Units (59,311)  
Proceeds from issuance of note payable 0 12,500,000
Payments on finance lease obligations (8,360) (7,816)
Net cash provided by financing activities 41,844,844 101,203,400
Net increase in cash and cash equivalents 6,044,557 74,483,564
Cash and cash equivalents - beginning of period 55,921,152 26,752,135
Cash and cash equivalents - end of period $ 61,965,709 $ 101,235,699

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