Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Dec. 31, 2016 |
|
| Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | ||
| Warrant liability | $ 180 | $ 232 |
| 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 | 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
|