Fair Value Measurements - Summary of Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total marketable securities	$ 2,501
U.S. Corporate Bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total marketable securities	1,003
Foreign Corporate Bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total marketable securities	1,498
Level 1 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total marketable securities	2,501
Level 1 [Member] | U.S. Corporate Bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total marketable securities	1,003
Level 1 [Member] | Foreign Corporate Bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total marketable securities	$ 1,498