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Leases - Schedule of Components of Lease Expense (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Fixed operating lease cost	$ 187,000
Short-term lease costs	8,000
Total lease expense	195,000
Operating cash flows from operating leases	201,000
Leased assets obtained in exchange for new operating lease liabilities	$ 781	[1]
Weighted-average remaining lease term-operating leases	3 years 10 months 24 days
Weighted-average discount rate-operating leases	9.00%
[1] Acquired in Merger with Arsanis

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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