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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 26, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | May 26, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Net proceeds from issuance of common stock, after deducting offering expenses |  |  | $ 81,562 |
Common Stock [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Net proceeds from issuance of common stock, after deducting offering expenses | $ 78,100 |  |  |
Total shares issued | 11,500,000 |  |  |
Public offering price of common stock issued | $ 7.25 |  |  |
ATM Agreement [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock issuable and sellable under offering agreement |  |  |  | $ 75,000
ATM Agreement [Member] | Common Stock [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Net proceeds from issuance of common stock, after deducting offering expenses |  | $ 3,400 |  |
Total shares issued |  | 871,149 |  |
Commission paid to sales agent |  | $ 100 |  |

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