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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 | $ (6,886,000) | $ (8,482,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Common stock issued for services | 17,000 | 14,000
Share based compensation | 800,000 | 685,000
Depreciation and amortization | 210,000 | 240,000
Abandonment and impairment of capitalized patent costs | 0 | 733,000
Change in operating assets and liabilities: |  |
Contract assets | (53,000) | 0
Prepaid expenses and other assets | (75,000) | 109,000
Accounts payable and accrued liabilities | (382,000) | (236,000)
Accrued compensation and taxes | 361,000 | (15,000)
Contract liabilities | 44,000 | 50,000
Net cash used in operating activities | (5,964,000) | (6,902,000)
Cash flows from investing activities: |  |
Acquisition of fixed assets | (17,000) | (20,000)
Disbursements for patents and other intangible assets | (177,000) | (398,000)
Maturity of short term treasury bills | 0 | 6,923,000
Net cash provided by (used in) investing activities | (194,000) | 6,505,000
Cash flows from financing activities: |  |
Proceeds from issuance of common stock, net of offering costs | 6,053,000 | 0
Proceeds from exercise of stock options | 126,000 |
Proceeds from Payroll Protection Program loan | 251,000 |
Net cash provided by financing activities | 6,430,000 | 0
Net increase (decrease) in cash and cash equivalents | 272,000 | (397,000)
Cash and cash equivalents, beginning of period | 8,552,000 | 8,949,000
Cash and cash equivalents, end of period | $ 8,824,000 | $ 8,552,000

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