Related Party (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($)
Xunkai Gong [Member] \| 11/29/2013 Promissory Note [Member]
Related Party Transaction [Line Items]
Largest Aggregate Amount of Principal Outstanding During the Period	$ 1,010
Amount Outstanding	0
Amount of Principal Paid During the Period	1,010
Amount of Interest Paid During the Period	$ 150
Amount of Interest Payable on the Indebtedness	2.00%
Xunkai Gong [Member] \| 1/1/2016 Promissory Note [Member]
Related Party Transaction [Line Items]
Largest Aggregate Amount of Principal Outstanding During the Period	$ 14
Amount Outstanding	0
Amount of Principal Paid During the Period	14
Amount of Interest Paid During the Period	$ 3
Amount of Interest Payable on the Indebtedness	4.00%
Tianyi Jiang [Member] \| 11/29/2013 Promissory Note [Member]
Related Party Transaction [Line Items]
Largest Aggregate Amount of Principal Outstanding During the Period	$ 808
Amount Outstanding	0
Amount of Principal Paid During the Period	808
Amount of Interest Paid During the Period	$ 120
Amount of Interest Payable on the Indebtedness	2.00%
Tianyi Jiang [Member] \| 1/1/2016 Promissory Note [Member]
Related Party Transaction [Line Items]
Largest Aggregate Amount of Principal Outstanding During the Period	$ 59
Amount Outstanding	0
Amount of Principal Paid During the Period	59
Amount of Interest Paid During the Period	$ 12
Amount of Interest Payable on the Indebtedness	4.00%
Brian Brown [Member] \| 11/29/2013 Promissory Note [Member]
Related Party Transaction [Line Items]
Largest Aggregate Amount of Principal Outstanding During the Period	$ 808
Amount Outstanding	0
Amount of Principal Paid During the Period	808
Amount of Interest Paid During the Period	$ 120
Amount of Interest Payable on the Indebtedness	2.00%

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No definition available.

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- Definition

Maximum Aggregate Principal Outstanding

+ References

No definition available.

+ Details

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- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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- Definition

Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586

+ Details

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(16))
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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