Share-based compensation - Unvested Balance of Options (Detail)	3 Months Ended
Mar. 31, 2019 $ / shares shares
Number of options
Unvested, beginning balance (in shares) \| shares	0
Granted (in shares) \| shares	2,030,000
Unvested, ending balance (in shares) \| shares	2,030,000
Weighted average exercise price per share
Unvested, beginning balance (in usd per share) \| $ / shares	$ 0.00
Granted (in usd per share) \| $ / shares	4.64
Unvested, ending balance (in usd per share) \| $ / shares	$ 4.64
Weighted average remaining contractual term
Unvested	9 years 10 months

Share-based compensation arrangement by share based payment award options non-vested weighted average remaining contractual term.

No definition available.

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Sharebased compensation arrangement by sharebased payment award options nonvested weighted average exercise price per share.

No definition available.

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Sharebased compensation arrangement by sharebased payment award options nonvested weighted average exercise price per share.

No definition available.

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No definition available.

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Gross number of share options (or share units) granted during the period.

No definition available.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

No definition available.

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Number of non-vested options outstanding.

No definition available.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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