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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income (loss) | $ 69,450,766 | $ 56,342,010 | $ (7,241,147)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Depreciation and other amortization | 522,368 | 529,814 | 526,997
(Gain) loss on change in fair value of warrant liability | (117,770) | 3,525,846 | (5,091,256)
Stock-based compensation | 1,265,809 | 1,350,948 | 2,113,994
Write down of inventory, net | 618,771 | 0 | 0
Deferred income taxes provision (benefit) | 121,446 | 11,606,949 | (2,417,617)
Loss on extinguishment of Term Loan | 0 | 4,981,461 | 0
Non-cash interest expense | 0 | 887,132 | 4,497,271
Changes in assets and liabilities: |  |  |
Accounts receivable | (80,310,187) | 827,733 | (2,208,863)
Inventory | 136,369 | (8,009,992) | (6,744,644)
Prepaid expenses and other assets | 48,963 | 699,102 | (714,272)
Accounts payable, accrued expenses and other liabilities | 986,865 | (3,116,843) | 936,839
Income tax payable | 18,287,487 | 912,462 | 0
Deferred revenue | 483,749 | 982,606 | (1,861,605)
Net cash provided by (used in) operating activities | 11,494,636 | 71,519,228 | (18,204,303)
Cash flows from investing activities: |  |  |
Capital expenditures | (50,620) | (15,501) | (29,094)
Cash used in investing activities | (50,620) | (15,501) | (29,094)
Cash flows from financing activities: |  |  |
Payment of employee tax obligations for common stock tendered | (173,918) | (184,016) | (1,176,579)
Repurchase of common stock | (26,021,519) | (28,502,946) | 0
Repayment of Term Loan | 0 | (85,913,459) | 0
Cash used in financing activities | (26,195,437) | (114,600,421) | (1,176,579)
Net decrease in cash and cash equivalents | (14,751,421) | (43,096,694) | (19,409,976)
Cash, cash equivalents and restricted cash at the beginning of period | 117,890,240 | 160,986,934 | 180,396,910
Cash, cash equivalents and restricted cash at end of period | 103,138,819 | 117,890,240 | 160,986,934
Supplemental disclosure of cash flows information: |  |  |
Non-cash lease right-of-use asset and associated liability (net of deferred rent in 2019) | 733,715 | 0 | 2,944,932
Conversion of warrant to common stock | 0 | 3,003,517 | 1,172,801
Issuance of common stock upon cashless exercise | 0 | 97,250 | 118,500
Cash income taxes paid (refund), net | $ 1,063,744 | $ 3,718,581 | $ (1,276,129)

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