Fair Value Measurements - Additional Information (Detail) |
6 Months Ended |
|---|---|
Jun. 30, 2018 | |
| Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | |
| Maximum maturity period of cash and cash equivalents | 90 days |
| Maximum maturity period of short-term investments | 1 year |
| Maximum [Member] | |
| Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | |
| Maturity period of securities | 1 year |
| X | ||||||||||
- Definition Maturity period of securities. No definition available.
|
| X | ||||||||||
- Definition Maximum maturity period of cash and cash equivalents. No definition available.
|
| X | ||||||||||
- Definition Maximum maturity period of short term investments. No definition available.
|
| 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
|