Fair Value Measurements and Marketable Securities - Marketable Securities with Unrealized Losses (Detail) $ in Thousands |
Dec. 31, 2016
USD ($)
|
|---|---|
| Schedule Of Available For Sale Securities [Line Items] | |
| Marketable securities, in loss position for less than twelve months, Fair Value | $ 5,388 |
| Marketable securities, in loss position for less than twelve months, Unrealized Loss | (3) |
| Government Securities | |
| Schedule Of Available For Sale Securities [Line Items] | |
| Marketable securities, in loss position for less than twelve months, Fair Value | 1,997 |
| Marketable securities, in loss position for less than twelve months, Unrealized Loss | (1) |
| Corporate Debt Securities | |
| Schedule Of Available For Sale Securities [Line Items] | |
| Marketable securities, in loss position for less than twelve months, Fair Value | 3,391 |
| Marketable securities, in loss position for less than twelve months, Unrealized Loss | $ (2) |
| X | ||||||||||
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|