The Company and Summary of Significant Accounting Policies- Advertising and Research and Development (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2013
Accounting Policies [Abstract]
Research and Development Expense	$ 4,486	$ 22,176	$ 20,872	$ 19,257
Marketing and Advertising Expense	$ 21,158	109,738	111,162	$ 86,510
Prepaid Advertising		$ 1,084	$ 1,899