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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($)
Cash flows from operating activities: |  |
Net loss | $ (9,610) | $ (8,291)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 3,666 | 2,561
Common stock contribution to 401(k) | 90 | 88
Depreciation and amortization | 4 | 12
Amortization of debt issuance costs, debt discount and final payment on debt | 200 | 374
Provision for bad debt |  | 1,409
Non-cash lease expense | 79 | 74
Loss on extinguishment of debt | 300 |
Change in fair value of equity securities | (617) | 150
Changes in assets and liabilities: |  |
Trade and other receivables, net | 251 | 1,113
Income tax receivable | 1,526 | (1,526)
Prepaid expenses and other assets | (701) | (497)
Accounts payable and accrued liabilities | 748 | (152)
Operating lease liabilities | (88) | (79)
Unearned revenue recognized under units-of-revenue method | (731) | (695)
Other liabilities | (6) | 309
Net cash used in operating activities | (4,889) | (5,150)
Cash flows from investing activities: |  |
Payments related to purchase of royalty rights | (13,500) |
Net cash used in investing activities | (13,500) |
Cash flows from financing activities: |  |
Proceeds from issuance of preferred stock | 40,000 |
Proceeds from issuance of common stock |  | 26
Payment of preferred and common stock issuance costs | (3,106) | (211)
Proceeds from exercise of options | 1,355 | 25
Principal payments - debt | (4,250) | (1,875)
Payment for extinguishment of debt | (17,103) |
Payment for debt modification fee | (24) |
Payment for preferred stock dividends | (707) |
Principal payments - finance lease |  | (9)
Proceeds from disgorgement of stockholder's short-swing profits |  | 13
Taxes paid related to net share settlement of equity awards | (355) | (16)
Net cash provided by (used in) financing activities | 15,810 | (2,047)
Net decrease in cash and restricted cash | (2,579) | (7,197)
Cash and restricted cash at the beginning of the period | 86,364 | 56,688
Cash and restricted cash at the end of the period | 83,785 | 49,491
Supplemental Cash Flow Information: |  |
Cash paid for interest | 311 | 379
Non-cash investing and financing activities: |  |
Preferred stock dividend accrual | 1,424 |
Interest added to principal balance on long-term debt |  | 317
Accrued cost related to issuance of common stock |  | $ 19
Accrued cost related to issuance of preferred stock | $ 105 |

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