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Commitments and Contingencies - Summary of Maturities of Sublease Income and Operating Lease Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Sublease Income
2020 (remaining)	$ 1,286
2021	5,201
2022	5,357
2023	5,518
2024	5,684
Thereafter	39,596
Total	62,642
Operating Lease Liabilities
2020 (remaining)	1,730
2021	6,925
2022	6,239
2023	5,377
2024	5,521
Thereafter	36,373
Total	62,165
Present value adjustment	(23,497)
Total	$ 38,668	$ 40,884

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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- Definition

Lessor sublease rentals payments to be received due.

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No definition available.

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- Definition

Lessor sublease rentals payments to be received due.

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- Definition

Lessor sublease rentals payments to be received due thereafter.

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- Definition

Lessor sublease rentals payments to be received due year five.

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- Definition

Lessor sublease rentals payments to be received due year four.

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- Definition

Lessor sublease rentals payments to be received due year three

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No definition available.

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- Definition

Lessor sublease rentals payments to be received due year two.

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No definition available.

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- Definition

Lessor sublease rentals payments to be received remainder of fiscal year.

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No definition available.

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 842
-SubTopic 20
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-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal year.

+ References

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

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- Definition

Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

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