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Short-Term and Long-Term Investments - Summary of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2014
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Dec. 31, 2013
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|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | $ 29,742 | $ 25,771 |
| Gross Unrealized Gains | 5 | 3 |
| Gross Unrealized Losses | (11) | (3) |
| Fair Value | 29,736 | 25,771 |
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Certificates of Deposit [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 9,923 | 1,784 |
| Gross Unrealized Gains | 1 | |
| Gross Unrealized Losses | (11) | (1) |
| Fair Value | 9,913 | 1,783 |
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U.S. Government Agency Notes [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 19,819 | 23,987 |
| Gross Unrealized Gains | 4 | 3 |
| Gross Unrealized Losses | (2) | |
| Fair Value | $ 19,823 | $ 23,988 |