Subsequent and Other Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |
1 Months Ended | |
|---|---|---|
Feb. 28, 2017 |
Jan. 31, 2014 |
|
| Subsequent Event [Line Items] | ||
| Proceeds from common stock issued in public offerings | $ 18.8 | |
| Common stock share issued in public offering | 5,000,000 | |
| Subsequent Event [Member] | ||
| Subsequent Event [Line Items] | ||
| Proceeds from common stock issued in public offerings | $ 20.9 | |
| Common stock share issued in public offering | 22,772,300 | |
| Common stock offering price | $ 1.01 | |