Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 81,411	$ 196,113
Unrealized Gains	8	78
Unrealized Losses	(4)	(66)
Estimated Fair Value	81,415	196,125
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	24,289	44,806
Unrealized Gains		7
Unrealized Losses		(1)
Estimated Fair Value	24,289	44,812
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	57,122	151,307
Unrealized Gains	8	71
Unrealized Losses	(4)	(65)
Estimated Fair Value	57,126	151,313
Cash \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	3,557	4,561
Estimated Fair Value	3,557	4,561
Money Market Funds \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	18,981	21,193
Estimated Fair Value	18,981	21,193
U.S. Government Agency Securities \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	1,751
Estimated Fair Value	1,751
U.S. Government Agency Securities \| Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	28,685	17,628
Unrealized Gains	3
Unrealized Losses	(2)	(6)
Estimated Fair Value	28,686	17,622
U.S. Treasuries \| Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	3,499
Estimated Fair Value	3,499
Corporate Debt Securities \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost		19,052
Unrealized Gains		7
Unrealized Losses		(1)
Estimated Fair Value		19,058
Corporate Debt Securities \| Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	24,938	133,679
Unrealized Gains	5	71
Unrealized Losses	(2)	(59)
Estimated Fair Value	$ 24,941	$ 133,691

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

+ References

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-Publisher FASB
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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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