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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Cash flows from operating activities: |  |
Net loss | $ (14,046) | $ (9,368)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 4,445 | 3,269
Common stock contribution to 401(k) | 90 | 88
Depreciation and amortization | 6 | 19
Amortization of debt issuance costs, debt discount and final payment on debt | 200 | 546
Provision for bad debt |  | 1,409
Non-cash lease expense | 119 | 112
Loss on extinguishment of debt | 300 |
Change in fair value of equity securities | 482 | (1,891)
Changes in assets and liabilities: |  |
Trade and other receivables, net | (255) | 1,302
Income tax receivable | 1,526 | (1,526)
Prepaid expenses and other assets | (526) | (319)
Accounts payable and accrued liabilities | 955 | (464)
Operating lease liabilities | (133) | (120)
Unearned revenue recognized under units-of-revenue method | (1,121) | (1,052)
Other liabilities | (6) | 409
Net cash used in operating activities | (7,964) | (7,586)
Cash flows from investing activities: |  |
Payments related to purchase of royalty rights | (20,500) |
Purchase of property and equipment |  | (9)
Net cash used in investing activities | (20,500) | (9)
Cash flows from financing activities: |  |
Proceeds from issuance of preferred stock | 40,000 |
Proceeds from issuance of common stock | 17 | 26
Payment of preferred and common stock issuance costs | (3,248) | (231)
Proceeds from exercise of options | 1,492 | 42
Principal payments - debt | (4,250) | (3,188)
Payment for extinguishment of debt | (17,103) |
Payment for debt modification fee | (24) |
Payment for preferred stock dividends | (2,131) |
Principal payments - finance lease |  | (14)
Proceeds from disgorgement of stockholder's short-swing profits |  | 13
Taxes paid related to net share settlement of equity awards | (479) | (16)
Net cash provided by (used in) financing activities | 14,274 | (3,368)
Net decrease in cash and restricted cash | (14,190) | (10,963)
Cash and restricted cash at the beginning of the period | 86,364 | 56,688
Cash and restricted cash at the end of the period | 72,174 | 45,725
Supplemental Cash Flow Information: |  |
Cash paid for interest | 311 | 546
Non-cash investing and financing activities: |  |
Preferred stock dividend accrual | 1,368 |
Interest added to principal balance on long-term debt |  | $ 317
Accrued cost related to issuance of capital stock | $ 137 |

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