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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Cash flows used in operating activities: |  |  |  |  |  |  |
Net loss | $ (1,728) | $ (1,087) | $ 526 | $ (3,150) | $ (4,654) | $ (11,771) |
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  | 273 | 778 |
Amortization of deferred financing costs and debt discount |  |  |  |  | 428 | 354 |
In process research and development acquired from NanoTx Therapeutics |  |  |  |  | 781 |  |
Noncash lease expenses |  |  |  |  | 2 | 22 |
Change in fair value of warrants | 81 |  | 561 |  | (2,342) | 69 |
Share-based compensation expense |  |  |  |  | 149 | 106 |
Loss on sale of business |  |  |  |  |  | 6,508 |
Allocation of issuance costs associated with warrants |  |  | 1,233 |  |  | 1,233 |
Increases (decreases) in cash caused by changes in operating assets and liabilities: |  |  |  |  |  |  |
Accounts receivable |  |  |  |  | 1,169 | (4,851) |
Inventories |  |  |  |  |  | 274 |
Other current assets |  |  |  |  | 516 | 252 |
Other assets |  |  |  |  | 54 | 298 |
Accounts payable and accrued expenses |  |  |  |  | (1,586) | (297) |
Deferred revenues |  |  |  |  |  | 29 |
Other long-term liabilities |  |  |  |  |  | 54 |
Net cash used in operating activities |  |  |  |  | (5,210) | (6,942) |
Cash flows provided by (used in) investing activities: |  |  |  |  |  |  |
Purchases of property and equipment |  |  |  |  | (37) | (8) |
In process research and development acquired from NanoTx Therapeutics |  |  |  |  | (400) |  |
Proceeds from sale of business |  |  |  |  |  | 5,637 |
Net cash provided by (used in) investing activities |  |  |  |  | (437) | 5,629 |
Cash flows used in financing activities: |  |  |  |  |  |  |
Principal payments of long-term obligations |  |  |  |  | (5,307) | (3,490) |
Payment of financing lease liability | (42) |  | (1) |  | (93) | (75) |
Proceeds from exercise of warrants |  |  |  |  | 1,081 | 491 |
Proceeds from sale of common stock, net |  |  |  |  |  | 15,964 |
Net cash provided by (used in) financing activities |  |  |  |  | (4,319) | 12,890 |
Effect of exchange rate changes on cash and cash equivalents |  |  |  |  |  | (4) |
Net increase (decrease) in cash and cash equivalents |  |  |  |  | (9,966) | 11,573 |
Cash, cash equivalents, and restricted cash at beginning of period |  | $ 17,592 |  | $ 5,301 | 17,592 | 5,301 | $ 5,301
Cash, cash equivalents, and restricted cash at end of period | $ 7,626 |  | $ 16,874 |  | 7,626 | 16,874 | $ 17,592
Cash paid during period for: |  |  |  |  |  |  |
Interest |  |  |  |  | 470 | 1,071 |
Supplemental schedule of non-cash investing and financing activities: |  |  |  |  |  |  |
Issuance costs paid in common stock |  |  |  |  | 463 |  |
Common stock issued in payment for in process research and development |  |  |  |  | 381 |  |
Offering cost paid in warrants |  |  |  |  |  | 213 |
Unpaid offering costs |  |  |  |  | $ 12 | $ 403 |

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