Warrants - Summary of Warrants Outstanding (Detail) - $ / shares |
9 Months Ended | ||
|---|---|---|---|
Sep. 30, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Class of Warrant or Right [Line Items] | |||
| Warrants Outstanding | 11,129,031 | 175,584 | 175,584 |
| Class One [Member] | |||
| Class of Warrant or Right [Line Items] | |||
| Exercise Price | $ 0.31 | ||
| Warrants Outstanding | 4,621,037 | ||
| Expiration Date | May 10, 2024 | ||
| Class Two [Member] | |||
| Class of Warrant or Right [Line Items] | |||
| Exercise Price | $ 0.31 | ||
| Warrants Outstanding | 6,024,124 | ||
| Expiration Date | Jul. 25, 2024 | ||
| Class Three [Member] | |||
| Class of Warrant or Right [Line Items] | |||
| Exercise Price | $ 0.31 | ||
| Warrants Outstanding | 483,870 | ||
| Expiration Date | Sep. 19, 2022 |