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Concentration of Risks - Summary of Concentration of Risk (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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 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 + Details
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