Concentration risk number of customers exceeding threshold

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Debt instrument maturity year.

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Employee stock purchase plan offering period.

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Extended 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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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an 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.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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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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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Describes the nature of the product warranty, including the approximate term of the product warranty, how the product warranty arose, and the events or circumstances that would require the warrantor to perform under the product warranty.

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Summary of Significant Accounting Policies - Additional Information (Detail)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2018 USD ($) Customer	Jun. 30, 2017 USD ($) Customer	Jun. 30, 2018 USD ($) Business Customer	Jun. 30, 2017 USD ($) Customer	Dec. 31, 2017 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
Number of business activities \| Business				1
Cash held in foreign banks		$ 5,600,000		$ 5,600,000		$ 4,500,000
Money market funds		13,700,000		13,700,000		30,300,000
Restricted cash		806,000		806,000		806,000
Write down of inventory		500,000	$ 1,300,000	$ 346,000	$ 3,386,000
Standard product warranty, description				Limited one- to five-year warranty
Impairment charges				$ 0
Interest or penalties recognized		0	$ 0	$ 0	$ 0
U.S. corporate income tax rate				21.00%
Employee stock purchase plan offering period				6 months
RSU's [Member]
Summary Of Significant Accounting Policies [Line Items]
Vesting term				4 years
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment				3 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment				5 years
Letter of Credit [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash		600,000		$ 600,000		600,000
Certificate of Deposit [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash		$ 200,000		$ 200,000		$ 200,000
Customer Concentration Risk [Member] \| Revenue [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage		10.00%	10.00%	10.00%	10.00%
Number of customers accounted 10% or more concentration risk \| Customer		0	0	0	0
Credit Concentration Risk [Member] \| Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage				10.00%		10.00%
Number of customers accounted 10% or more concentration risk \| Customer				0		0
1.75% Convertible Senior Notes due 2021 [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt instrument due year	2021			2021		2021