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Other Balance Sheet Details - Summary of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Accounts payable	$ 6,671		$ 3,355
Accrued research and development expenses	4,102		10,999
Accrued professional fees	1,118		1,930
Operating lease liabilities - current (included in Accounts payable and accrued liabilities on the Consolidated Balance Sheet)	3,214	$ 1,408	0
Deferred rent	0		204
Other	2,451		4,969
Total accounts payable and accrued liabilities	$ 17,556		$ 21,457

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Accrued research and development expenses.

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Amount of liabilities incurred and payable to vendors for goods and services received, and accrued liabilities classified as other.

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. 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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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. 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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For a classified balance sheet, the cumulative difference as of the balance sheet date between the payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, within one year of the balance sheet date.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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