Summary of Significant Accounting Policies - Share-Based Compensation, Net Loss Per Common Share and Income Taxes (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Apr. 17, 2014	Feb. 28, 2013	Aug. 01, 2011
Anti-dilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)					16,222	18,294	20,519
Numerator:
Net loss used in computing net loss per share					$ (25,504)	$ (40,209)	$ (35,448)
Denominator:
Weighted average shares used in computing loss per share Basic and Diluted	79,170	78,746	77,924	77,290	80,509	78,277	75,804
Income Taxes
Reduction in uncertain tax position due to lapse of various statutes of limitation					$ 1,600
Subsequent period within which no material changes in unrecognized tax benefits are expected					12 months
3.75% Convertible Notes
Anti-dilutive securities excluded from computation of earnings per share
Interest rate (as a percent)	3.75%				3.75%	3.75%				3.75%
Conversion shares outstanding principal amount excluded in the potentially diluted shares					3,900
3.50% Convertible Notes
Anti-dilutive securities excluded from computation of earnings per share
Interest rate (as a percent)	3.50%				3.50%	3.50%		3.50%	3.50%
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)					8,378	8,378	8,378
3.50% Series A Convertible Notes
Anti-dilutive securities excluded from computation of earnings per share
Interest rate (as a percent)	3.50%				3.50%	3.50%		3.50%
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)						2,896	4,985
Conversion shares outstanding principal amount excluded in the potentially diluted shares					13,200
Stock options
Anti-dilutive securities excluded from computation of earnings per share
Expiration period					10 years
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)					2,377	2,537	3,209
RSUs, PSUs and MSUs
Anti-dilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)					5,467	4,483	3,947