Quarterly report pursuant to Section 13 or 15(d)

Cash Equivalents and Investments (Schedule of Estimated Fair Value of Available-for-Sale Securities) (Details)

v3.10.0.1
Cash Equivalents and Investments (Schedule of Estimated Fair Value of Available-for-Sale Securities) (Details) - Investments [Member]
$ in Thousands
Sep. 30, 2018
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost, Due within one year $ 2,619
Estimated Market Value, Due within one year $ 2,618