Description of Business, Basis of Presentation and Going Concern - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions |
12 Months Ended | ||||
---|---|---|---|---|---|
Nov. 21, 2016 |
Apr. 30, 2017 |
Apr. 30, 2016 |
Apr. 30, 2015 |
Apr. 30, 2014 |
|
Organization And Basis Of Presentation [Line Items] | |||||
Percentage of voting interest owned | 81.00% | ||||
Accumulated deficit | $ 55,855 | $ 37,252 | |||
Cash and cash equivalents | $ 30,950 | $ 21,764 | $ 2,526 | $ 481 | |
Carbylan Therapeutics Inc. [Member] | |||||
Organization And Basis Of Presentation [Line Items] | |||||
Date of share purchase transaction | Nov. 21, 2016 | ||||
Percentage of interest owned by equity holders | 19.00% | ||||
Common shares issued to stockholders | 7.8 | ||||
Common shares retained by stockholders | 1.9 |
X | ||||||||||
- Definition Business acquisition percentage of voting interests held by acquiree. No definition available.
|
X | ||||||||||
- Definition Business combination common shares issued by acquiree. No definition available.
|
X | ||||||||||
- Definition Business combination common shares retained by acquiree. No definition available.
|
X | ||||||||||
- Definition Organization and basis of presentation. No definition available.
|
X | ||||||||||
- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Details
|