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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |
Net loss from operations | $ (45,147,883) | $ (55,765,455)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Change in fair value of warrants and embedded derivative |  | 1,870,923
Stock based compensation | 3,895,781 | 7,599,496
Depreciation and amortization | 249,583 | 66,663
Amortization of marketable securities discount | (530,104) | (497,267)
Cloud computing arrangement implementation costs | (1,114,568) | (107,754)
Noncash lease expense, net | 57,780 |
Noncash portion of litigation settlement | 16,692 |
Other | 76,279 | 12,136
Changes in operating assets and liabilities: |  |
Accounts receivable, net | (228,541) | (164,390)
Inventories | (4,961,770) | (1,621,615)
Prepaid expenses and other assets | 859,204 | (1,347,410)
Accounts payable | 2,797,727 | 1,858,519
Accrued expense and other current liabilities | (1,036,721) | 1,047,059
Deferred rent |  | (61,254)
Net cash used in operating activities | (45,066,541) | (47,110,349)
Cash flows from investing activities: |  |
Purchase of marketable securities | (37,224,879) | (81,058,590)
Proceeds from maturities of marketable securities | 88,266,000 | 44,509,684
Purchases of property and equipment | (69,675) | (278,921)
Net cash provided by (used in) investing activities | 50,971,446 | (36,827,827)
Cash flows from financing activities: |  |
Proceeds from note issued | 807,347 |
Repayments of note issued | (695,469) |
Sale of common stock, net of related expenses |  | 78,334,457
Proceeds from shares issued in connection with employee stock purchase plan | 48,965 |
Net cash provided by financing activities | 160,843 | 78,334,457
Effect of changes in exchange rates on cash and cash equivalents | (102,241) | (20,191)
Net increase (decrease) in cash and cash equivalents | 5,963,507 | (5,623,910)
Cash and cash equivalents – beginning of period | 7,600,284 | 13,224,194
Cash and cash equivalents – end of period | 13,563,791 | 7,600,284
Supplemental schedule of noncash financing activity: |  |
Reclass of warrant liability to additional paid in capital |  | 4,110,467
Reclass of deferred financing costs to additional paid in capital |  | 856,985
Stock dividend distribution in connection with IPO |  | 3,629,092
Capitalized cloud computing arrangement costs included in accounts payable and accrued expenses |  | 287,650
Cash paid during the year for: |  |
Income taxes paid | 29,542 | 45,641
Interest paid | $ 3,457 |
Series A Preferred Units |  |
Supplemental schedule of noncash financing activity: |  |
Equity converted to common stock |  | 53,518,463
Series B Preferred Units |  |
Supplemental schedule of noncash financing activity: |  |
Equity converted to common stock |  | 68,755,544
Common Units |  |
Supplemental schedule of noncash financing activity: |  |
Equity converted to common stock |  | $ 40,180,619

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