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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) Customer	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Customer Segment	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
Number of major customers representing outstanding trade receivables | Customer	3		3		3
Life of inventory			2 years
Protracted length of inventory			1 year
Inventory valuation reserves	$ 200,000		$ 200,000		$ 200,000
Estimated useful life of intangible assets			10 years
Number of reportable segments | Segment			1
Impairment charges on long-lived assets	0	$ 0	$ 0	$ 0
Period of warranty			1 year
Warranty claim liability	$ 0		$ 0		$ 0
Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment			3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment			5 years
Trade Accounts Receivable | Customer Concentration Risk
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage			46.00%		46.00%

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- Definition

Number of customers whose outstanding trade receivables by a single customer accounts for 10 percent or more of an entity's trade receivable.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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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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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount of valuation reserve for inventory.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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