Net income (loss) per share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Net income applicable to common stockholders:
Net loss	$ (4,767)	$ (7,555)	$ (15,427)	$ (11,543)
Weighted average common shares used in computing net loss per share, basic and diluted	40,140	38,777	39,863	38,698
Basic and diluted (in dollars per share)	$ (0.12)	$ (0.19)	$ (0.39)	$ (0.30)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	9,309	10,351	9,309	10,351
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	5,001	5,835	5,001	5,835
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	4,308	4,361	4,308	4,361
Restricted common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	0	155	0	155