Fair value of financial instruments (Tables)

3 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments Using Inputs

The fair values of these financial instruments were determined using the following inputs at September 30, 2013 (in thousands):

	Fair Value Measurements at September 30, 2013 Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Description
Cash equivalents:
Money market mutual funds	$	3,477	$	3,477	$	—	$	—
Total cash equivalents	3,477		3,477		—		—
Short-term investments:
Certificates of deposit	1,002		—		1,002		—
Municipal securities	141,923		—		141,923		—
Commercial paper	3,396		—		3,396		—
Corporate bonds	19,331		—		19,331		—
Total short-term investments	165,652		—		165,652		—
Cash equivalents and short-term investments	$	169,129	$	3,477	$	165,652	$	—

The fair values of our financial instruments were determined using the following inputs at June 30, 2013 (in thousands):

	Fair Value Measurements at June 30, 2013 Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Description
Cash equivalents:
Money market mutual funds	$	2,241	$	2,241	$	—	$	—
Total cash equivalents	2,241		2,241		—		—
Short-term investments:
Certificates of deposit	1,003		—		1,003		—
Municipal securities	148,993		—		148,993		—
Commercial paper	3,391		—		3,391		—
Corporate bonds	12,511		—		12,511		—
Total short-term investments	165,898		—		165,898		—
Cash equivalents and short-term investments	$	168,139	$	2,241	$	165,898	$	—