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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 07, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Issuance of common stock under public offering, net of issuance costs |  |  | $ 136,566 | $ 215,756 |
ATM Agreement |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock issuable and sellable under offering agreement |  |  | 75,000 |  | $ 75,000
Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Issuance of common stock under public offering, net of issuance costs | $ 12,700 | $ 14,200 | $ 127 | $ 142 |
Public offering price of common stock issued (in USD per share) | $ 11.50 | $ 16.25 |  |  |
Net proceeds from issuance of common stock, after deducting offering expenses | $ 136,300 | $ 215,800 |  |  |

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