Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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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Investments - Summary of Cash, Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Abstract]
Amortized Cost	$ 58,519	$ 91,060	$ 100,916	$ 85,586
Fair Value	58,519	91,060
Investments [Abstract]
Amortized Cost	112,146	150,549
Gross Unrealized Gains	24	1
Gross Unrealized Losses	(34)	(180)
Fair Value	112,136	150,370
Government agencies
Cash and Cash Equivalents [Abstract]
Amortized Cost	1,400
Fair Value	1,400
Cash and money market accounts
Cash and Cash Equivalents [Abstract]
Amortized Cost	55,621	91,060
Fair Value	55,621	91,060
Commercial paper
Cash and Cash Equivalents [Abstract]
Amortized Cost	1,498
Fair Value	1,498
Certificates of deposit (due within 1 year)
Investments [Abstract]
Amortized Cost	13,640	13,611
Gross Unrealized Gains	11	1
Gross Unrealized Losses	(1)	(7)
Fair Value	13,650	13,605
Certificates of deposit (due within 2 years)
Investments [Abstract]
Amortized Cost	960	4,760
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	(10)
Fair Value	962	4,750
Commercial paper
Investments [Abstract]
Amortized Cost	6,493	5,977
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	(11)
Fair Value	6,494	5,966
Corporate bonds (due within 1 year)
Investments [Abstract]
Amortized Cost	23,867	24,002
Gross Unrealized Gains	6	0
Gross Unrealized Losses	(28)	(65)
Fair Value	23,845	23,937
Corporate bonds (due within 2 years)
Investments [Abstract]
Amortized Cost	4,145	9,142
Gross Unrealized Gains	2	0
Gross Unrealized Losses	(5)	(84)
Fair Value	4,142	9,058
Government agencies
Investments [Abstract]
Amortized Cost	4,522	1,997
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	(3)
Fair Value	4,524	1,994
Total investments
Investments [Abstract]
Amortized Cost	53,627	59,489
Gross Unrealized Gains	24	1
Gross Unrealized Losses	(34)	(180)
Fair Value	$ 53,617	$ 59,310