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Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) LicenseAgreement	Dec. 31, 2017 USD ($) LicenseAgreement	Dec. 31, 2016 USD ($) Customer LicenseAgreement
Significant Accounting Policies [Line Items]
Cash receivables	$ 100				$ 100				$ 100	$ 100
Deferred Revenue	306				3,283				306	3,283
Changes In Deferred Revenue									(3,000)	(500)	$ 800
Selling, general, and administrative expenses	$ 45,015	$ 41,267	$ 34,229	$ 34,810	$ 37,532	$ 32,511	$ 25,809	$ 25,092	155,321	120,944	77,525
Advertising and Marketing Costs [Member]
Significant Accounting Policies [Line Items]
Selling, general, and administrative expenses									10,100	9,100	6,800
Product Design and Development Costs [Member]
Significant Accounting Policies [Line Items]
Selling, general, and administrative expenses									$ 4,700	$ 4,700	$ 2,300
Credit Concentration Risk [Member] | Accounts Receivable [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage									10.00%	9.00%
Customer Concentration Risk [Member] | Sales Revenue [Member]
Significant Accounting Policies [Line Items]
Number of customer | Customer											1
Number of license agreements | LicenseAgreement									3	0	1
Customer Concentration Risk [Member] | Sales Revenue [Member] | License Agreements One [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage									15.00%		15.00%
Customer Concentration Risk [Member] | Sales Revenue [Member] | License Agreements Two [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage									11.00%
Customer Concentration Risk [Member] | Sales Revenue [Member] | License Agreements Three [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage									10.00%
Customer Concentration Risk [Member] | Sales Revenue [Member] | Customer One [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage											12.00%
Maximum [Member]
Significant Accounting Policies [Line Items]
Cash equivalents, receivables settlement term									5 days

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Cash equivalents receivables settlement term.

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Number of customer.

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Significant accounting policies.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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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.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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