Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 85,382	$ 81,411
Unrealized Gains	3	8
Unrealized Losses	(29)	(4)
Estimated Fair Value	85,356	81,415
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	21,473	24,289
Unrealized Losses	(1)
Estimated Fair Value	21,472	24,289
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	63,909	57,122
Unrealized Gains	3	8
Unrealized Losses	(28)	(4)
Estimated Fair Value	63,884	57,126
Cash \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	2,160	3,557
Estimated Fair Value	2,160	3,557
Money Market Funds \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	17,312	18,981
Estimated Fair Value	17,312	18,981
Corporate Debt Securities \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	2,001
Unrealized Losses	(1)
Estimated Fair Value	2,000
Corporate Debt Securities \| Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	33,637	24,938
Unrealized Gains	2	5
Unrealized Losses	(10)	(2)
Estimated Fair Value	33,629	24,941
U.S. Treasuries \| Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	6,807	3,499
Unrealized Losses	(8)
Estimated Fair Value	6,799	3,499
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	23,465	28,685
Unrealized Gains	1	3
Unrealized Losses	(10)	(2)
Estimated Fair Value	$ 23,456	$ 28,686

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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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