Organization and Summary of Significant Accounting Policies (Investments in Privately Held Companies) (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
	Mar. 08, 2017	Sep. 30, 2017	Dec. 31, 2016
Derivative Financial Instruments
Foreign currency forward contract		$ 0.0	$ 0.0
Privately Held Companies | Subordinated convertible promissory notes
Investments in Privately Held Companies
Amount invested in subordinated convertible promissory notes		$ 1.4	$ 6.1
Percentage of ownership interest in private company	9.00%
Privately Held Companies | Subordinated convertible promissory notes | Other Assets
Investments in Privately Held Companies
Estimated fair value	$ 7.1