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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	Mar. 08, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Organization And Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit		$ 665,800,000		$ 665,800,000		$ 671,800,000
Accrued Healthcare Obligations		2,700,000		2,700,000
Cash, cash equivalents and short-term investments		606,100,000		606,100,000
Working capital		665,200,000		665,200,000
Share-based compensation		25,600,000	$ 25,300,000	50,200,000	$ 55,900,000
Stock-based compensation, unvested restricted stock units		$ 172,600,000		$ 172,600,000
Sales returns coverage period				30 days
Performance Shares [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	43,370
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years
Performance Shares [Member] | Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Performance Shares [Member] | Maximum
Organization And Summary Of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 4,500,000.0

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Organization And Summary Of Significant Accounting Policies [Line Items]

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Revenue Recognition, Sales Returns, Coverage Period

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Working Capital

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Percentage of vesting of share-based compensation awards.

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Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

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