Stockholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands |
|
|
6 Months Ended |
|
Dec. 14, 2017 |
May 03, 2017 |
Apr. 30, 2018 |
Oct. 31, 2017 |
| Stockholders' Equity Note |
|
|
|
|
| Common stock, shares authorized |
|
|
225,000,000
|
125,000,000
|
| Excess percentage of common shares outstanding |
19.90%
|
|
|
|
| Series C Warrants [Member] |
|
|
|
|
| Stockholders' Equity Note |
|
|
|
|
| Class of Warrant or Right, Outstanding |
|
|
11,569,364
|
11,580,900
|
| Series D Warrants [Member] |
|
|
|
|
| Stockholders' Equity Note |
|
|
|
|
| Class of Warrant or Right, Outstanding |
|
|
|
2,584,174
|
| Series A Warrants [Member] |
|
|
|
|
| Stockholders' Equity Note |
|
|
|
|
| Class of Warrant or Right, Exercise Price of Warrants or Rights |
|
|
$ 5.83
|
|
| Class of Warrant or Right, Outstanding |
|
|
7,680,000
|
|
| Common Stock | Series C Warrants [Member] |
|
|
|
|
| Stockholders' Equity Note |
|
|
|
|
| Stock issued during period, shares, new issues |
|
|
11,536
|
|
| Net proceeds from common stock and warrants |
|
|
$ 20
|
|
| Common Stock | Series D Warrants [Member] |
|
|
|
|
| Stockholders' Equity Note |
|
|
|
|
| Stock issued during period, shares, new issues |
|
|
2,584,174
|
|
| Net proceeds from common stock and warrants |
|
|
$ 3,300
|
|
| Convertible Preferred Offering [Member] | Series C Preferred Stock [Member] |
|
|
|
|
| Stockholders' Equity Note |
|
|
|
|
| Preferred stock offering date |
2017-09
|
|
|
|
| Underwritten Public Offering [Member] |
|
|
|
|
| Stockholders' Equity Note |
|
|
|
|
| Stock issued during period, shares, new issues |
|
12,000,000
|
|
|
| Underwritten Public Offering [Member] | Series C Warrants [Member] |
|
|
|
|
| Stockholders' Equity Note |
|
|
|
|
| Class of warrants or rights issued |
|
12,000,000
|
|
|
| Class of Warrant or Right, Exercise Price of Warrants or Rights |
|
$ 1.60
|
|
|
| Class of warrant or right term |
|
5 years
|
|
|
| Underwritten Public Offering [Member] | Series D Warrants [Member] |
|
|
|
|
| Stockholders' Equity Note |
|
|
|
|
| Class of warrants or rights issued |
|
12,000,000
|
|
|
| Class of Warrant or Right, Exercise Price of Warrants or Rights |
|
$ 1.28
|
|
|
| Class of warrant or right term |
|
1 year
|
|
|