Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 127,003	$ 81,411
Unrealized Gains	1	8
Unrealized Losses	(43)	(4)
Estimated Fair Value	126,961	81,415
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	37,675	24,289
Estimated Fair Value	37,675	24,289
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	89,328	57,122
Unrealized Gains	1	8
Unrealized Losses	(43)	(4)
Estimated Fair Value	89,286	57,126
Cash \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	2,233	3,557
Estimated Fair Value	2,233	3,557
Money Market Funds \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	18,215	18,981
Estimated Fair Value	18,215	18,981
U.S. Government Agency Securities \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	4,496	1,751
Estimated Fair Value	4,496	1,751
U.S. Government Agency Securities \| Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	38,902	28,685
Unrealized Gains		3
Unrealized Losses	(26)	(2)
Estimated Fair Value	38,876	28,686
Corporate Debt Securities \| Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	12,731
Estimated Fair Value	12,731
Corporate Debt Securities \| Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	43,638	24,938
Unrealized Gains	1	5
Unrealized Losses	(8)	(2)
Estimated Fair Value	43,631	24,941
U.S. Treasuries \| Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	6,788	3,499
Unrealized Losses	(9)
Estimated Fair Value	$ 6,779	$ 3,499

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

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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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