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Fair Value Measurements (Detail Textuals) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents, primarily include money market funds	$ 48,963	$ 51,608	$ 49,125	$ 51,913
Fair value on recurring basis | Money market funds (included in cash and cash equivalents) | Fair Value Measurement, Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents, primarily include money market funds	$ 47,800	$ 50,000

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