Net income (loss) per share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Net income applicable to common stockholders:
Net loss	$ (2,723)	$ (3,997)	$ (10,660)	$ (3,988)
Basic:
Weighted average common shares used in computing basic net income (loss) per share (in shares)	39,916	38,508	39,727	38,660
Diluted:
Weighted average common shares used in computing basic net income (loss) per share (in shares)	39,916	38,508	39,727	38,660
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.07)	$ (0.10)	$ (0.27)	$ (0.10)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	10,197	9,211	10,197	9,211
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	5,387	5,935	5,387	5,935
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	4,810	3,048	4,810	3,048
Restricted common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	0	228	0	228