|
Fair Value Measurements - Summary of Assets Carried at Fair Value Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
|
Jun. 30, 2014
|
Dec. 31, 2013
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Securities available for sale |
$ 29,736 |
$ 25,771 |
|
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Money market funds |
23,840 |
45,268 |
|
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Money market funds |
23,840 |
45,268 |
|
Significant Other Observable Inputs (Level 2) [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Money market funds |
29,736 |
25,771 |
|
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Agency Notes [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Securities available for sale |
19,823 |
23,988 |
|
Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Securities available for sale |
9,913 |
1,783 |
|
Carrying Value [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Money market funds |
53,576 |
71,039 |
|
Carrying Value [Member] | U.S. Government Agency Notes [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Securities available for sale |
19,823 |
23,988 |
|
Carrying Value [Member] | Money Market Funds [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Money market funds |
23,840 |
45,268 |
|
Carrying Value [Member] | Certificates of Deposit [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Securities available for sale |
$ 9,913 |
$ 1,783 |