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Cash, Cash Equivalents and Marketable Securities - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) Investment	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Investment	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Cash, cash equivalents and marketable securities [Line Items]
Long-term marketable securities, minimum original maturity term			1 year
Marketable securities, average remaining contractual maturity period			2 months
Long-term marketable securities	$ 0		$ 0		$ 0
Number of debt securities in unrealized loss positions | Investment	2		2
Debt securities in unrealized loss positions, total fair market value	$ 1,498,000		$ 1,498,000
Credit risk	0		0
Gain (loss) on investments	0	$ 0	$ 0	$ 0
Minimum
Cash, cash equivalents and marketable securities [Line Items]
Short-term marketable securities, minimum original maturity term			90 days
Maximum
Cash, cash equivalents and marketable securities [Line Items]
Debt securities in unrealized loss positions, total unrealized loss	$ 1,000		$ 1,000

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Cash, cash equivalents and marketable securities

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Impact Of Credit Risk On Fair Value Of Derivatives

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Long Term Marketable Securities Maturities Term, Minimum

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Marketable Debt Securities Weighted Average Remaining Maturity Period

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer.

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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