Summary of Significant Accounting Policies - Net loss Per Common Share and Outstanding Convertible Notes - Diluted Share Impact (Details) - USD ($) shares in Thousands, $ in Thousands			3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Aug. 31, 2016	Jun. 30, 2016	Jan. 31, 2016	Apr. 17, 2014	Feb. 28, 2013	Aug. 01, 2011
Numerator:
Net loss used to compute basic and diluted loss per share			$ (9,369)	$ (6,027)	$ (19,295)	$ (19,053)
Denominator:
Weighted average shares used in computing basic and diluted loss per share			82,328	80,346	81,952	80,053
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)	16,850	18,402
3.50% Convertible Notes
Denominator:
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
3.50% Series A Convertible Notes
Denominator:
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)		2,781
Conversion shares outstanding principal amount excluded in the potentially diluted shares					13,200
3.75% Convertible Notes
Denominator:
Interest rate (as a percent)	3.75%		3.75%		3.75%		3.75%	3.75%	3.75%			3.75%
Conversion shares outstanding principal amount excluded in the potentially diluted shares					10,600
Stock options
Denominator:
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)	2,850	2,409
RSUs, PSUs and MSUs
Denominator:
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)	5,622	4,834