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Equity-based compensation - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Liquidation value | $ 0 |
PICU |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Weighted-average grant-date fare value per unit | $ 442.30 | $ 0.00
Compensation expense | $ 30,961.00 | $ 0.00
Unrecognized compensation cost | 2,654 |
Net proceeds from issue of share | 99,960 |
Fair value of units vested during the period | $ 130,921 | $ 0
PICU | Unvested restricted common stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued, unvested | 8,359 | 12,485

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