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CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Statement of Financial Position [Abstract] |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ | $ 1,568 | $ 1,568 | $ 1,646
Common stock par value, in dollars per share | $ / shares | $ 0.002 | $ 0.002 | $ 0.002
Common stock, shares authorized | 200,000,000 | 200,000,000 | 300,000,000
Common stock, shares issued | 173,507,000 | 173,507,000 | 170,820,000
Common stock, shares outstanding | 173,507,000 | 173,507,000 | 170,820,000
Stock split | 2 | 2 |

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