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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued payroll and related expenses	$ 526	$ 1,643	$ 1,189
Accrued restructuring cost	96	516
Accrued research and development expenses	627	3,171	1,028
Other	106	153	510
Total accrued liabilities	$ 1,355	$ 5,483	$ 2,727

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Accrued research and development expenses current.

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Accrued restructuring costs current.

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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