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Revenues - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Accrued sales returns included in accrued expenses and other current liabilities	$ 11,414
Accrued sales incentives included in accrued expenses and other current liabilities	$ 6,260	$ 13,001
Product Concentration Risk | Total Service Revenue | Maximum
Total service revenue as percentage of revenues	1.00%

X

- 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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Accrued Sales Returns

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No definition available.

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