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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |
Net loss | $ (111,186,000) | $ (40,110,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |
Depreciation and amortization | 27,946,000 | 18,426,000
Fair value adjustment on derivative instrument | 597,000 | 0
Provision for bad debts, net of recoveries | 512,000 | 715,000
Impairment of capitalized software | 1,410,000 | 0
Provision for excess and obsolete inventory | 538,000 | 980,000
Share-based compensation expense | 10,419,000 | 7,302,000
Amortization of debt discount and debt issuance costs | 4,016,000 | 9,772,000
Loss on debt conversion and extinguishment, net | 76,354,000 | 0
Deferred income taxes | 659,000 | (598,000)
Other | 667,000 | 840,000
Changes in assets and liabilities: |  |
Accounts receivable | (10,797,000) | 377,000
Inventories | (13,336,000) | (3,077,000)
Prepaid expenses and other assets | (3,070,000) | (901,000)
Accounts payable | 27,087,000 | (12,996,000)
Accrued expenses, income taxes, and other | 8,234,000 | 1,271,000
Net cash provided by (used in) operating activities | 20,050,000 | (17,999,000)
Cash flows from investing activities: |  |
Purchases of property, plant and equipment | (5,736,000) | (6,621,000)
Proceeds from the sale of property, plant and equipment | 392,000 | 517,000
Additions to capitalized software development costs and purchases of intangible assets | (29,369,000) | (22,109,000)
Net cash used in investing activities | (34,713,000) | (28,213,000)
Cash flows from financing activities: |  |
Gross proceeds received from issuance of Series E preferred stock | 25,000,000 | 10,000,000
Gross proceeds from the issuance of 2025 Notes | 100,000,000 | 0
Payment of issuance costs related to 2025 Notes | (3,645,000) | 0
Cash paid to investors in private exchange transactions | (32,062,000) | 0
Payoff of term loan and related extinguishment costs | (48,830,000) | 0
Repurchase of Series E preferred stock | (2,354,000) | 0
Proceeds from the exercise of warrants to purchase common stock | 1,861,000 | 17,542,000
Net borrowing of bank and overdraft facilities | (199,000) | (1,047,000)
Principal payments under finance lease obligations | (2,756,000) | (1,022,000)
Proceeds from stock option exercises and employee stock purchase plan, net of taxes paid on vested restricted stock units | 5,066,000 | 1,996,000
Net cash provided by financing activities | 42,081,000 | 27,469,000
Effect of exchange rates on cash | 523,000 | (259,000)
Net increase (decrease) in cash, cash equivalents and restricted cash | 27,941,000 | (19,002,000)
Cash, cash equivalents and restricted cash, beginning of period | 12,074,000 | 31,076,000
Cash, and cash equivalents, end of period | 40,015,000 | 12,074,000
Supplemental disclosures of cash flow information: |  |
Interest | 3,215,000 | 9,296,000
Income taxes, net of tax refunds | 142,000 | 939,000
Supplemental disclosures of non-cash activities: |  |
Transfer of inventories to rental assets | 4,036,000 | 3,748,000
Purchases of property, plant and equipment under capital lease | 664,000 | 1,341,000
Right-of-use assets obtained in exchange for operating leases liabilities | 7,931,000 | 4,694,000
Capital expenditures financed through accounts payable or accrued liabilities | 5,710,000 | 2,926,000
Issuance of common stock under Settlement Agreement | 972,000 | 1,439,000
Preferred stock issued in extinguishment of term loan accrued interest | 2,330,000 | 0
Debt discount and issuance costs extinguished in notes conversion | 1,728,000 | 0
2022 Notes conversion to equity | 59,907,000 | 0
Novatel Wireless Notes conversion to equity | 250,000 | 0
2025 Notes issued to extinguish 2022 Notes | 80,375,000 | 0
2025 Notes conversion, including shares issued in satisfaction of interest-make-whole payment | $ 14,353,000 | $ 0

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 + Details
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