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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | May 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Net proceeds from sale of shares, after deducting underwriting discounts and commissions and other estimated offering expenses |  | $ 215,756,000 | $ 81,562,000 |
ATM Agreement [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock issuable and sellable under offering agreement |  | $ 75,000,000 |  |
ATM Agreement [Member] | Maximum [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock issuable and sellable under offering agreement |  |  |  | $ 75,000,000
Common Stock [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Sale of common stock in underwritten public offering | 14.2 |  |  |
Sale of common stock, public offering price | $ 16.25 |  |  |
Net proceeds from sale of shares, after deducting underwriting discounts and commissions and other estimated offering expenses | $ 215,800,000 |  |  |

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