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Stockholders' Equity - Equity Offerings (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 5 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | May 31, 2017 | Jun. 30, 2016 | Dec. 31, 2017 | May 23, 2017 | Dec. 31, 2016 | Dec. 31, 2018
September 2017 At-The-Market |  |  |  |  |  |  |
Equity offerings |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares |  |  |  | 1,600,000 |  |  |
Weighted average price per share issued |  |  |  | $ 12.50 |  |  |
Aggregate net proceeds from stock sale |  |  |  | $ 19.3 |  |  |
Common stock available for sale under agreement |  |  |  |  |  |  | $ 80.0
Securities sold during period |  |  |  |  |  |  | 0
March 2016 At-The-Market |  |  |  |  |  |  |
Equity offerings |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares |  |  |  |  | 1,388,647 | 668,791 |
Weighted average price per share issued |  |  |  |  | $ 5.55 | $ 6.336 |
Aggregate net proceeds from stock sale |  |  |  |  | $ 7.4 | $ 3.9 |
Public Equity Offering |  |  |  |  |  |  |
Equity offerings |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares | 8,050,000 | 8,050,000 | 3,476,793 |  |  |  |
Weighted average price per share issued | $ 17.00 | $ 11.50 | $ 6.10 |  |  |  |
Aggregate net proceeds from stock sale | $ 128.4 | $ 86.8 | $ 19.7 |  |  |  |

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