Fair Value Measurements - Additional Information (Detail) |
9 Months Ended |
|---|---|
|
Sep. 30, 2017
USD ($)
shares
| |
| Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | |
| Warrant liability | $ | $ 3,000 |
| Maximum maturity period of cash and cash equivalents | 90 days |
| Maximum maturity period of short-term investments | 1 year |
| Series A and Series B Warrants issued in July 2014 Financing [Member] | |
| Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | |
| Warrants outstanding and exercisable | shares | 0 |
| 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 Number of warrants or rights outstanding. 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 | ||||||||||
- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|