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Fair Value Measurements and Investments in Marketable Securities - Available-for-sale Securities (Detail) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Schedule Of Available For Sale Securities [Line Items]  
Amortized Cost $ 131,153
Gross Unrealized Gains 32
Gross Unrealized Losses (34)
Aggregate Estimated Fair Value 131,151
1 year or less | Government Sponsored Entities  
Schedule Of Available For Sale Securities [Line Items]  
Amortized Cost 51,178
Gross Unrealized Gains 12
Aggregate Estimated Fair Value $ 51,190
1 year or less | Government Sponsored Entities | Maximum  
Schedule Of Available For Sale Securities [Line Items]  
Maturity (in years) 1 year
1 year or less | Commercial Paper  
Schedule Of Available For Sale Securities [Line Items]  
Amortized Cost [1] $ 1,499
Gross Unrealized Gains [1] 1
Aggregate Estimated Fair Value [1] $ 1,500
1 year or less | Commercial Paper | Maximum  
Schedule Of Available For Sale Securities [Line Items]  
Maturity (in years) [1] 1 year
1 year or less | Corporate Debt Securities  
Schedule Of Available For Sale Securities [Line Items]  
Amortized Cost $ 51,326
Gross Unrealized Gains 4
Gross Unrealized Losses (20)
Aggregate Estimated Fair Value $ 51,310
1 year or less | Corporate Debt Securities | Maximum  
Schedule Of Available For Sale Securities [Line Items]  
Maturity (in years) 1 year
1-2 years | Government Sponsored Entities  
Schedule Of Available For Sale Securities [Line Items]  
Amortized Cost $ 10,690
Gross Unrealized Gains 11
Gross Unrealized Losses (3)
Aggregate Estimated Fair Value $ 10,698
1-2 years | Government Sponsored Entities | Minimum  
Schedule Of Available For Sale Securities [Line Items]  
Maturity (in years) 1 year
1-2 years | Government Sponsored Entities | Maximum  
Schedule Of Available For Sale Securities [Line Items]  
Maturity (in years) 2 years
1-2 years | Corporate Debt Securities  
Schedule Of Available For Sale Securities [Line Items]  
Amortized Cost $ 13,460
Gross Unrealized Gains 2
Gross Unrealized Losses (11)
Aggregate Estimated Fair Value $ 13,451
1-2 years | Corporate Debt Securities | Minimum  
Schedule Of Available For Sale Securities [Line Items]  
Maturity (in years) 1 year
1-2 years | Corporate Debt Securities | Maximum  
Schedule Of Available For Sale Securities [Line Items]  
Maturity (in years) 2 years
More than 2 years | Government Sponsored Entities | Minimum  
Schedule Of Available For Sale Securities [Line Items]  
Maturity (in years) 2 years
More than 2 years | Corporate Debt Securities  
Schedule Of Available For Sale Securities [Line Items]  
Amortized Cost $ 3,000
Gross Unrealized Gains 2
Aggregate Estimated Fair Value $ 3,002
More than 2 years | Corporate Debt Securities | Minimum  
Schedule Of Available For Sale Securities [Line Items]  
Maturity (in years) 2 years
[1] Included within cash and cash equivalents on the Company’s condensed consolidated balance sheet.