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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Oct. 10, 2017 | Oct. 05, 2017 | Mar. 31, 2018
Common Stock [Member] | JGB Debt [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Common stock shares issued | 651,240 | 288,022 | 6,161,331
Common stock offer price per share |  | $ 4.34 | $ 4.33
Conversion of debentures into shares of common stock |  | $ 1,250 | $ 26,700
2017 Public Offering [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Common stock shares issued | 4,992,840 |  |
Common stock offer price per share | $ 4.00 |  |
Net proceeds from common stock shares issued at public offering | $ 18,300 |  |
Over-allotments [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Common stock shares issued | 651,240 |  |

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