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Stock-based compensation (Tables)
 3 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Stock option activity
A summary of our stock option activity is as follows (in thousands except per share and contractual life amounts):

Number of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Life
(years)		Aggregate
Intrinsic
Value
Options outstanding as of June 30, 20201,638 $6.55 
Granted— — 
Exercised(14)4.92 
Canceled or expired(9)5.56 
Options outstanding as of September 30, 20201,615 $6.56 4.95$— 
As of September 30, 2020:
Options vested and expected to vest1,603 $6.58 4.92$— 
Options exercisable1,468 $6.70 4.64$— 
Restricted stock units award activity
A summary of our restricted stock unit, or RSU, activity is as follows (in thousands except contractual life amounts):
 Number of
Shares		Weighted
Average
Remaining
Contractual 
Life
(years)		Aggregate
Intrinsic 
Value
RSUs outstanding as of June 30, 20202,476 
Granted380 
Vested(235)
Canceled(77)
RSUs outstanding as of September 30, 20202,544 1.32$9,157 
As of September 30, 2020:
RSUs expected to vest 2,269 1.23$8,168 
Summary of shares available for grant activity A summary of our shares available for grant activity is as follows (in thousands):
 Number of
Shares
Shares available for grant as of June 30, 20205,280 
Shares added from 5,800,000 reserved share pool available(1)
84 
Granted(575)
RSUs withheld for taxes in net share settlements5 
Canceled or expired2 
Shares available for grant as of September 30, 20204,796 
(1) Additional shares are available up to a maximum of 5,800,000 shares only to the extent shares subject to grants under the 2009 Plan were outstanding as of November 20, 2019 but later expire or otherwise terminate without having been exercised in full.
Stock-based compensation expense
The following table summarizes the stock-based compensation expense for continuing operations recorded for stock options, RSUs, including performance-based RSUs, and ESPP purchase rights (in thousands):
 
 Three Months Ended
September 30,
 20202019
Stock option awards$108 $308 
RSU awards2,351 1,444 
ESPP398 — 
Total stock-based compensation expense$2,857 $1,752 
Weighted average assumptions used to value ESPP purchase rights The weighted average assumptions used to value ESPP purchase rights during the initial offering period beginning March 1, 2020 and subsequent offering period beginning September 1, 2020 were as follows:
Expected volatility88 %
Expected term (in years)0.65
Risk-free interest rate0.38 %
Dividend yield— %