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Shareholders' Equity (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Apr. 30, 2017 | Mar. 31, 2017 | Apr. 30, 2015 | Sep. 30, 2014 | Aug. 31, 2014 | Jun. 30, 2010 | Sep. 30, 2004 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2013
Sale of stock common, shares | 346,000 | 30,000 | 200,000 |  |  |  |  |  |  |  |  |  |
Common stock at purchase price per share | $ 4.50 | $ 7.78 | $ 7.85 |  |  |  |  |  |  | $ 4.50 |  |  |
Proceeds from offering expenses | $ 1,375 | $ 219 | $ 1,554 |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  | $ 443 | $ 457 |
Option exercised during period, value |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant-date fair value per share price |  |  |  |  |  |  |  |  |  |  | $ 3.90 | $ 5.87 |
Unamortized compensation expense |  |  |  |  |  |  |  |  | $ 61 |  | $ 61 |  |
Unamortized compensation expense remaining service period |  |  |  |  |  |  |  |  |  |  | 1 year 7 days |  |
Restricted stock units vested and settled |  |  |  |  |  |  |  |  |  |  | 13,000 |  |
Common stock issued, withholding taxes |  |  |  |  |  |  |  |  |  |  | 9,000 |  |
Preferred stock series A, shares authorized |  |  |  |  |  |  |  |  | 156,000 |  | 156,000 | 156,000 |
Preferred stock series A, shares issued |  |  |  |  |  |  |  |  | 156,000 |  | 156,000 | 156,000 |
Preferred stock series A, shares outstanding |  |  |  |  |  |  |  |  | 156,000 |  | 156,000 | 156,000 |
Payment of dividends |  |  |  |  |  |  |  |  |  |  | $ 16 | $ 16 |
Number of shares converted |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Cumulative Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  |  |  | $ 1.00 |  | $ 1.00 |  |
Debt instrument, conversion price |  |  |  |  |  |  |  |  | 13.439 |  | $ 13.439 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares converted |  |  |  |  |  |  |  |  |  |  | 12,000 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant-date fair value per share price |  |  |  |  |  |  |  |  |  |  | $ 5.13 |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  | 74,000 |  |
Number of shares granted, description |  |  |  |  |  |  |  |  |  |  | During the year ended December 31, 2018, the Company granted approximately 74,000 restricted stock units with a weighted average grant date fair value of $5.13 per restricted stock unit, all of which vest as to 16.67% of the total underlying shares on the six month anniversary of the grant date and as to the balance of the total underlying shares in 30 substantially equal monthly installments, beginning on the seven month anniversary of the grant date, subject to accelerated vesting in the event of a change in control. |  |
Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued to purchase number of common stock |  |  |  |  |  |  |  |  |  |  |  |  | 72,000
Fair value of the warrants |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,379
Warrants [Member] | Risk Free Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions, measurement input, percentages |  |  |  |  |  |  |  |  |  |  |  |  | 1.06%
Warrants [Member] | Dividend Yield [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions, measurement input, percentages |  |  |  |  |  |  |  |  |  |  |  |  | 0.00%
Warrants [Member] | Expected Volatility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions, measurement input, percentages |  |  |  |  |  |  |  |  |  |  |  |  | 80.25%
Warrants [Member] | Expected Term [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions, measurement input, term |  |  |  |  |  |  |  |  |  |  |  |  | 5 years
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative preferred stock dividend price per share |  |  |  |  |  |  |  |  | $ 0.10 | $ 0.10 |  |  |
Six Month Anniversary [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock vesting, percentage |  |  |  |  |  |  |  |  |  |  | 16.67% |  |
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  | 25,000 |  |
Chief Financial Officer [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  | 15,000 |  |
2004 Performance Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized to issue |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
2010 Amended Performance Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized to issue |  |  |  |  |  |  | 120,000 |  |  |  |  |  |
Incentive plan expiry description |  |  |  |  |  |  | The Amended 2010 Plan expires in February 2020. |  |  |  |  |  |
Options outstanding |  |  |  |  |  |  |  |  | 62,000 |  | 62,000 |  |
Number of option available for grants |  |  |  |  |  |  |  |  | 47,000 |  | 47,000 |  |
2010 Amended Performance Incentive Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized to issue |  |  |  |  |  |  | 120,000 |  |  |  |  |  |
2010 Amended Performance Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized to issue |  |  |  |  |  |  | 240,000 |  |  |  |  |  |
2014 Inducement Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized to issue |  |  |  |  |  | 85,000 |  |  |  |  |  |  |
Incentive plan expiry description |  |  |  |  |  | The 2014 Plan expires in September 2024. |  |  |  |  |  |  |
2014 Inducement Plan [Member] | First Anniversary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Option expected to vest during period, percentage |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
2014 Inducement Plan [Member] | 36 substantially equal monthly installments thereafter [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Option expected to vest during period, percentage |  |  |  | 75.00% |  |  |  |  |  |  |  |  |
2014 Inducement Plan [Member] | Mr Krishnan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Option issued to purchase number of additional common stock |  |  |  | 15,000 | 70,000 |  |  |  |  |  |  |  |

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