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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable, allowance for doubtful accounts | $ 153 | $ 720
Preferred stock, par value | $ .001 | $ .001
Preferred stock, shares authorized | 2,000,000 | 2,000,000
Preferred stock, shares issued |  |
Preferred stock, shares outstanding |  |
Common stock, par value | $ 0.001 | $ 0.001
Common stock, shares authorized | 30,000,000 | 30,000,000
Common stock, shares issued | 11,915,184 | 11,738,623
Common stock, shares outstanding | 11,907,542 | 11,730,981
Treasury stock, shares | 7,642 | 7,642
Series B Preferred Stock [Member] |  |
Preferred stock of subsidiary, par value | $ 0 | $ 0
Preferred stock of subsidiary, shares authorized | 1,467,396 | 1,467,396
Preferred stock of subsidiary, shares issued | 0 | 1,284,730
Preferred stock of subsidiary, shares outstanding | 0 | 1,284,730
Preferred stock of subsidiary, liquidation value | $ 1.00 | $ 1.00
Preferred stock of subsidiary, accrued and unpaid dividends | $ 0 | $ 995

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