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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net (loss) income | $ (4,758) | $ 3,233 |
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities: |  |  |
Stock-based compensation expense | 1,788 | 1,728 |
Common stock contribution to 401(k) | 88 | 102 |
Depreciation and amortization | 6 | 6 |
Amortization of debt issuance costs, debt discount and final payment on debt | 191 | 110 |
Provision for bad debt | 1,409 |  |
Non-cash lease expense | 37 | 488 |
Change in fair value of equity securities | 273 | (715) |
Changes in assets and liabilities: |  |  |
Trade and other receivables, net | 212 | (1,329) |
Income tax receivable | (1,526) |  |
Prepaid expenses and other assets | 147 | 42 |
Accounts payable and accrued liabilities | 38 | (116) |
Unearned revenue recognized under units-of-revenue method | (304) | (105) |
Operating lease liabilities | (39) | (528) |
Other liabilities | 158 | 241 |
Net cash (used in) provided by operating activities | (2,280) | 3,157 |
Cash flows from investing activities: |  |  |
Payments related to purchase of royalty rights |  | (300) |
Net cash used in investing activities |  | (300) |
Cash flows from financing activities: |  |  |
Proceeds from exercise of options |  | 237 |
Payment of preferred and common stock issuance costs for prior year | (166) | (376) |
Principal payments – debt | (938) |  |
Principal payments – finance lease | (5) | (3) |
Proceeds from disgorgement of stockholder's short-swing profits | 13 |  |
Taxes paid related to net share settlement of equity awards |  | (59) |
Net cash used in financing activities | (1,096) | (201) |
Net (decrease) increase in cash | (3,376) | 2,656 |
Cash at the beginning of the period | 56,688 | 45,780 | $ 45,780
Cash at the end of the period | 53,312 | 48,436 | $ 56,688
Supplemental Cash Flow Information: |  |  |
Cash paid for interest | $ 199 | 107 |
Non-cash investing and financing activities: |  |  |
Prepaid financing cost related to issuance of common stock |  | 66 |
Estimated fair value of contingent consideration under the royalty purchase agreements |  | $ 75 |

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