Financial Risk Management - Additional Information (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) Customer	Dec. 31, 2016 USD ($) Customer
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Provision for doubtful debts	$ 421	$ 138
Cash and cash equivalent and short-term investments	86,554
Amount of accounts receivables	19,298	$ 20,357
Amount of credit facilities, for the support of performance guarantee	2,000
Performance guarantees outstanding under the credit facility	$ 31
Revenue from Rights Concentration Risk [Member]
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Number of customers \| Customer	1	3
Revenue from Rights Concentration Risk [Member] \| Revenue, Rights Granted [Member]
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Concentration risk percentage	55.00%
Revenue from Rights Concentration Risk [Member] \| Customer One [Member] \| Revenue, Rights Granted [Member]
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Concentration risk percentage		18.00%
Revenue from Rights Concentration Risk [Member] \| Customer Two [Member] \| Revenue, Rights Granted [Member]
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Concentration risk percentage		14.00%
Revenue from Rights Concentration Risk [Member] \| Customer Three [Member] \| Revenue, Rights Granted [Member]
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Concentration risk percentage		11.00%
Credit Concentration Risk [Member] \| Accounts Receivable [Member]
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Number of customers \| Customer	1	2
Credit Concentration Risk [Member] \| Customer One [Member] \| Accounts Receivable [Member]
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Concentration risk percentage	23.00%	80.00%
Credit Concentration Risk [Member] \| Customer Two [Member] \| Accounts Receivable [Member]
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Concentration risk percentage		16.00%
Currency Denomination Concentration Risk [Member] \| Cash And Cash Equivalents and Short Term Investments [Member]
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Concentration risk percentage	9.50%

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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.

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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Concentration risk major customer.

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- Definition

Performance guarantees outstanding under the credit facility.

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