Organization and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands, member in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) country member	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2019 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of streaming members (more than) | member	139.0
Number of countries (over) | country	190
Number of members subscribing to legacy DVD-by-mail service (more than) | member	2.0
Streaming content library, useful life (in years)	1 year
Advertising expense	$ 1,808,000	$ 1,091,000	$ 842,000
Technology and development	1,210,000	981,000	768,000
Foreign currency transaction gain (loss)	73,953	(140,790)	0
Interest and Other Income (Expense)
Organization And Summary Of Significant Accounting Policies [Line Items]
Foreign currency transaction gain (loss)	$ (1,000)	$ (128,000)	$ 23,000
Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Content assets, useful life (in years)	10 years
Maximum
Organization And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life	30 years
Forecast
Organization And Summary Of Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset				$ 700,000
Operating lease, liability				$ 700,000