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Concentration of Risks - Summary of Concentration of Risk (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue [Member]
Market Risk, Credit Risk And Liquidity Risk [Line Items]
Concentration risk amount	$ 14,161	$ 10,810
Concentration risk percentage	38.00%	53.00%
Revenue [Member] | Customer 1 [Member]
Market Risk, Credit Risk And Liquidity Risk [Line Items]
Concentration risk amount	$ 9,710	$ 8,561
Concentration risk percentage	26.00%	42.00%
Revenue [Member] | Customer 2 [Member]
Market Risk, Credit Risk And Liquidity Risk [Line Items]
Concentration risk amount	$ 4,451	$ 2,249
Concentration risk percentage	12.00%	11.00%
Accounts Receivable [Member]
Market Risk, Credit Risk And Liquidity Risk [Line Items]
Concentration risk amount	$ 1,111	$ 1,416
Concentration risk percentage	26.00%	38.00%
Accounts Receivable [Member] | Customer 1 [Member]
Market Risk, Credit Risk And Liquidity Risk [Line Items]
Concentration risk amount	$ 998	$ 1,126
Concentration risk percentage	23.00%	30.00%
Accounts Receivable [Member] | Customer 2 [Member]
Market Risk, Credit Risk And Liquidity Risk [Line Items]
Concentration risk amount	$ 113	$ 290
Concentration risk percentage	3.00%	8.00%

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- Definition

Concentration Of Credit Risk Amount

+ References

No definition available.

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- Definition

Market Risk, Credit Risk And Liquidity Risk [Line Items]

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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