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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net loss | $ (13,243) | $ (15,694)
Adjustments to reconcile net loss to net cash flows used in operating activities: |  |
Depreciation and amortization | 1,118 | 1,265
Amortization of operating lease right-of-use asset | 231 |
Amortization of finance lease right-of-use asset | 63 |
Amortization (accretion) of deferred financing costs, debt discounts and debt premiums | 111 | (21)
Loss (gain) on extinguishment of debt | 20 | (376)
Gain on settlement of liability, net | (1,437) | (263)
Loss on settlement of equity instrument |  | 385
Loss on litigation | 266 |
Loss on issuance of convertible notes | 1,870 | 1,328
Loss on extinguishment of convertible notes |  | 2,903
Stock-based compensation | 668 | 529
Impairment of intangible assets and goodwill | 1,590 | 4,685
Provision for losses on doubtful accounts | 966 | 581
Warrant revaluation | (416) | (1,918)
Loss on modification of warrants | 1,128 |
Derivative revaluation | 415 | (267)
Changes in operating assets and liabilities: |  |
Accounts receivable | (850) | (541)
Inventories | 13 | (36)
Other assets | 427 | 127
Accounts payable | (1,884) | 309
Operating lease liabilities | (223) |
Accrued expenses and other liabilities | 26 | 250
Net cash used in operating activities | (9,141) | (6,754)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchase of property and equipment | (55) | (97)
Net cash used in investing activities | (55) | (97)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Principal payments on finance lease obligations | (46) | (58)
Payment of deferred financing costs | (120) | (138)
Payment of fractional common shares in conjunction with reverse stock split | (1) |
Issuance of common stock, net of issuance costs | 6,628 | 2,008
Proceeds from exercise of warrants | 1,575 | 1,271
Proceeds from long-term debt |  | 300
Proceeds from convertible notes | 2,150 | 3,850
Principal payments on convertible notes | (50) |
Principal payments on long-term debt | (473) | (422)
Net cash flows provided by financing activities | 9,663 | 6,811
NET CHANGE IN CASH | 467 | (40)
CASH AT BEGINNING OF PERIOD | 381 | 421
CASH AT END OF PERIOD | 848 | 381
SUPPLEMENTAL CASH FLOW INFORMATION |  |
Cash paid during the period for interest | 36 | 42
SUPPLEMENTAL DISCLOSURE OF CONSULTING SERVICES OR ANY OTHER NON-CASH COMMON STOCK RELATED ACTIVITY |  |
Purchases of equipment financed through accounts payable | 1 | 38
Equipment financed through finance lease obligations | 23 | 106
Deferred debt issuance cost financed through accounts payable |  | 57
Discount of 9% on issuance of convertible bridge notes | 188 | 405
Other current liabilities canceled in exchange for common shares |  | 1,897
Conversion of convertible debt plus interest into common stock | 7,553 | 2,356
Beneficial conversion feature on issuance of convertible notes | 1,792 | 2,118
Initial valuation of derivative liability recorded in conjunction with issuance of convertible notes |  | 610
Initial valuation of warrant liability recorded in conjunction with issuance of convertible notes | 1,858 | 2,665
Long-term debt exchanged for convertible notes |  | 3,191
Liabilities exchanged for convertible notes | 2,150 |
Prepaid insurance financed with loan | 434 | 375
Accounts payable converted to long-term debt |  | 74
Liability recorded related to equity purchase agreement repricing | $ 460 | 460
Warrant liability canceled due to settlement of equity instruments |  | $ 456
Issuance of common stock for consulting services | - | 39
Modification of warrant in conjunction with convertible note issuance |  | $ 11
Proceed from issuance of convertible note recorded through other current assets |  | 250
Write-off of beneficial conversion feature in conjunction with convertible note extinguishment |  | 1,029
Right-of-use assets obtained in exchange for lease obligations | $ 750 |
Amounts included in measurement of lease liabilities | 273 |
Write-off warrant liability in conjunction with warrant exercises | 2,364 |
Write-off of debt discounts (net of debt premiums) in conjunction with convertible note conversions | 731 | 210
Write-off of derivative liability in conjunction with convertible note conversions | $ 477 | $ 310

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