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Stockholders' Equity (Narrative) (Details) - USD ($) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 25, 2019 | Jul. 31, 2018 | Jun. 01, 2018 | Sep. 14, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2003 | Dec. 31, 2017
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  | 300,000,000 | 300,000,000 |  |  |  |  |  |
Common stock, par value |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |
Preferred stock, par value |  |  |  |  | $ 10.00 | $ 10.00 |  |  |  |  |  |
Options, Exercised (in shares) |  |  |  |  | 31,276 | 173,130 |  |  |  |  |  |
Convertible Preferred Stock, Shares Issuable upon Conversion |  |  |  |  | The Company’s shares of Series N preferred stock, each of which is convertible to 40 common shares, have the right to receive dividends or dividend equivalents should the Company declare dividends on its common stock |  |  |  |  |  |  |
Series N preferred stock, each convertible to common shares |  |  |  |  | 40 |  |  |  |  |  |  |
Series N preferred shares, conversion price per share |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Term of Stock-Based Compensation Plan |  |  |  |  | 6 years 9 months 18 days | 3 years 2 months 12 days |  |  |  |  |  |
Exercise Price, Outstanding |  |  |  |  | $ 0.51 | $ 0.75 |  |  |  |  |  | $ 0.97
Options to purchase, Granted (in shares) |  |  |  |  | 649,850 | 526,500 |  |  |  |  |  |
Exercise price, options granted in period |  |  |  |  | $ 0.74 | $ 0.43 |  |  |  |  |  |
Options, Expired |  |  |  |  | 765,000 | 1,016,870 |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 283,000 | $ 289,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares |  |  |  |  | 1,454,514 | 1,770,200 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value |  |  |  |  | $ 0.39 | $ 0.31 |  |  |  |  |  |
Unrecognized stock-based compensation |  |  |  |  | $ 500,000 |  |  |  |  |  |  |
Unrecognized stock-based compensation, Period for recognition |  |  |  |  | 2 years 6 months |  |  |  |  |  |  |
Fair Value of Options Vested in Period |  |  |  |  | $ 300,000 | $ 300,000 |  |  |  |  |  |
Aggregate intrinsic value of exercisable options |  |  |  |  | $ 1,200,000 | $ 11,000 |  |  |  |  |  |
Other Options Issued [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options to purchase, Granted (in shares) |  |  |  |  | 265,000 |  |  | 625,000 |  |  |  |
Options, Expired |  |  |  |  | 625,000 | 0 |  |  |  |  |  |
Stock Options [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 300,000 | $ 300,000 |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense |  |  |  |  | $ 200,000 | $ 200,000 |  |  |  |  |  |
Minimum [Member] | Other Options Issued [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price, options granted in period |  |  |  |  | $ 0.70 |  |  |  |  |  |  |
Maximum [Member] | Other Options Issued [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price, options granted in period |  |  |  |  | $ 0.85 |  |  |  |  |  |  |
Employees [Member] | NLEX [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options, Exercised (in shares) |  |  |  |  |  | 173,130 |  |  |  |  |  |
Options to purchase, Granted (in shares) |  |  | 300,000 |  |  |  |  |  |  |  |  |
Options, Expired |  | 126,870 |  |  |  |  |  |  |  |  |  |
2003 Stock Option and Appreciation Rights Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares Authorized for Stock-Based Compensation Plan |  |  |  |  |  |  |  |  |  |  | 2,000,000 |
Term of Stock-Based Compensation Plan |  |  |  |  |  |  |  |  |  |  | 10 years |
Stock Option Award Vesting Period |  |  |  |  |  |  |  |  |  |  | 4 years |
Exercise Price, Outstanding |  |  |  |  |  |  |  |  |  |  | $ 1.00 |
Options to purchase, Granted (in shares) |  |  |  |  | 0 |  |  |  |  |  |  |
Options, Expired |  |  |  |  | 140,000 | 660,000 |  |  |  |  |  |
2010 Non-Qualified Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares Authorized for Stock-Based Compensation Plan |  |  |  |  |  |  |  |  |  | 1,250,000 |  |
Stock Option Award Vesting Period |  |  |  |  |  |  |  |  |  | 4 years |  |
Options to purchase, Granted (in shares) |  |  |  |  | 60,000 | 85,000 |  |  |  |  |  |
2010 Non-Qualified Stock Option Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise Price, Outstanding |  |  |  |  |  |  |  |  |  | $ 0.24 |  |
2010 Non-Qualified Stock Option Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise Price, Outstanding |  |  |  |  |  |  |  |  |  | $ 0.70 |  |
2010 Non-Qualified Stock Option Plan [Member] | Directors [Member] | Annual Compensation Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options to purchase, Granted (in shares) |  |  |  |  | 60,000 | 85,000 |  |  |  |  |  |
Equity Partners Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares Authorized for Stock-Based Compensation Plan |  |  |  |  |  |  |  |  | 230,000 |  |  |
Options to purchase, Granted (in shares) |  |  |  |  |  |  |  |  | 230,000 |  |  |
Exercise price, options granted in period |  |  |  |  |  |  |  |  | $ 1.83 |  |  |
Options, Expired |  |  |  |  |  | 230,000 |  |  |  |  |  |
2016 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options, Exercised (in shares) |  |  |  |  | 31,276 | 173,130 |  |  |  |  |  |
Number of Shares Authorized for Stock-Based Compensation Plan |  |  |  | 3,150,000 |  |  |  |  |  |  |  |
Stock Option Award Vesting Period |  |  |  | 4 years |  |  |  |  |  |  |  |
Options to purchase, Granted (in shares) |  |  |  |  | 324,850 | 441,500 | 2,539,200 |  |  |  |  |
Options, Expired |  |  |  |  | 0 | 126,870 |  |  |  |  |  |
2016 Stock Option Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise Price, Outstanding |  |  |  | $ 0.45 |  |  |  |  |  |  |  |
2016 Stock Option Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise Price, Outstanding |  |  |  | $ 0.85 |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options, Exercised (in shares) |  |  |  |  | 10,783 | 173,130 |  |  |  |  |  |
Issuance of restricted common stock, shares |  |  |  |  |  | 600,000 |  |  |  |  |  |
Share price |  |  |  |  | $ 25.00 |  |  |  |  |  |  |
Series N preferred stockholders to liquidation preference, conversion price per share |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issuable upon Conversion |  |  |  |  | Each share of Series N preferred stock has a voting entitlement equal to 40 common shares, votes with the common stock on an as-converted basis and is senior to all other preferred stock of the Company. Dividends, if any, will be paid on an as-converted basis equal to common stock dividends. The conversion value of each share of Series N preferred stock is $1,000, and each share is convertible to 40 common shares at the rate of $25.00 per common share. The holders of shares of Series N preferred stock are entitled to liquidation preference over common stockholders equivalent to $1,000 per share. |  |  |  |  |  |  |
Conversion of series N preferred stock to shares of common stock |  |  |  |  | 0 | 0 |  |  |  |  |  |
Maxim Group LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, for Services, Shares | 75,000 |  |  |  |  |  |  |  |  |  |  |
David Ludwig And Tom Ludwig [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of restricted common stock, shares |  |  | 600,000 |  |  |  |  |  |  |  |  |
David Ludwig And Tom Ludwig [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 52,000 | $ 30,000 |  |  |  |  |  |
Shares restriction term of service |  |  | 5 years |  |  |  |  |  |  |  |  |
Weighted average grant date fair value |  |  |  |  |  | $ 0.43 |  |  |  |  |  |

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