Summary of Significant Accounting Policies | Description of Business . Basis of Presentation . Inventories . June 30, December 31, 2020 2019 Raw materials $ 43,000 $ 47,000 Work-in-process 12,000 16,000 Finished goods 257,000 259,000 $ 312,000 $ 322,000 Property and Equipment . June 30, December 31, 2020 2019 Property and Equipment: Production tooling, machinery and equipment $ 3,685,000 $ 3,685,000 Office furniture and fixtures 425,000 393,000 Computer equipment and software 1,438,000 1,426,000 5,548,000 5,504,000 Accumulated depreciation and amortization (5,125,000 ) (4,955,000 ) Net Property and Equipment $ 423,000 $ 549,000 Depreciation expense was approximately $85,000 and $170,000 in the three and six months ended June 30, 2020, respectively, and was $259,000 and $440,000 in the three and six months ended June 30, 2019, respectively. Stock-Based Compensation During the six-month periods ended June 30, 2020 and 2019 no equity awards were issued by the Company. During the six months ended June 30, 2020 no restricted stock units were issued by the Company. In June 2019, non-employee members of the Board of Directors received restricted stock grants totaling 70,755 shares pursuant to the 2018 Equity Incentive Plan (the “2018 Plan”). The shares underlying the awards were assigned a value of $1.06 per share, which was the closing price of the Company’s common stock on the date of grant, for a total grant date value of $75,000. The awards vested in full on the day immediately preceding the date of the 2020 annual shareholder meeting, July 29, 2020. In June 2019, the Company also issued 8,370 shares of common stock in settlement of $9,000 of total deferred fees due to a non-employee director’s departure from the board. The Company’s non-employee directors are eligible to participate in a director deferred compensation plan, which allows a director to make voluntary deferrals of up to 100% of their annual cash retainers relating to board or committee chair service. The Company estimated the fair value of stock-based awards granted during the six months ended June 30, 2020 under the Company’s employee stock purchase plan using the following weighted average assumptions: expected life of 1.0 year, expected volatility of 58.5%, dividend yield of 0% and risk-free interest rate of 1.56%. Total stock-based compensation expense recorded for the three and six months ended June 30, 2020 was $59,000 and $108,000, respectively, and for the three and six months ended June 30, 2019 was $139,000 and $277,000, respectively. Net Loss per Share . Due to the net loss incurred during the three and six months ended June 30, 2020 and 2019 all outstanding stock options were anti-dilutive for those periods. Weighted average common shares outstanding for the three and six months ended June 30, 2020 and 2019 were as follows: Three Months Ended Six Months Ended June 30 June 30 2020 2019 2020 2019 Denominator for basic net loss per share - weighted average shares 12,078,000 11,888,000 12,072,000 11,872,000 Effect of dilutive securities: Stock options and restricted stock units — — — — Denominator for diluted net loss per share - weighted average shares 12,078,000 11,888,000 12,072,000 11,872,000 |