Fair Value of Financial Instruments (Details) $ in Thousands	Jun. 30, 2015 USD ($)
Fair Value Assets Measured On Recurring Basis [Line Items]
Total cash equivalents	$ 16,912
Total investments	64,652
Total assets measured at fair value	81,564
Money market funds
Fair Value Assets Measured On Recurring Basis [Line Items]
Total cash equivalents	4,485
Commercial paper
Fair Value Assets Measured On Recurring Basis [Line Items]
Total cash equivalents	5,999
Total investments	26,482
Corporate debt securities
Fair Value Assets Measured On Recurring Basis [Line Items]
Total cash equivalents	1,457
Total investments	34,387
Municipal bonds
Fair Value Assets Measured On Recurring Basis [Line Items]
Total cash equivalents	4,971
Total investments	3,783
Level 1
Fair Value Assets Measured On Recurring Basis [Line Items]
Total cash equivalents	4,485
Total assets measured at fair value	4,485
Level 1 | Money market funds
Fair Value Assets Measured On Recurring Basis [Line Items]
Total cash equivalents	4,485
Level 2
Fair Value Assets Measured On Recurring Basis [Line Items]
Total cash equivalents	12,427
Total investments	64,652
Total assets measured at fair value	77,079
Level 2 | Commercial paper
Fair Value Assets Measured On Recurring Basis [Line Items]
Total cash equivalents	5,999
Total investments	26,482
Level 2 | Corporate debt securities
Fair Value Assets Measured On Recurring Basis [Line Items]
Total cash equivalents	1,457
Total investments	34,387
Level 2 | Municipal bonds
Fair Value Assets Measured On Recurring Basis [Line Items]
Total cash equivalents	4,971
Total investments	$ 3,783