Investments (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash and cash equivalents:
AMORTIZED COST	$ 270,648	$ 197,569	$ 242,650	$ 197,945
FAIR VALUE	270,648	197,569
Investments:
AMORTIZED COST	15,464	52,114
GROSS UNREALIZED GAINS	0	0
GROSS UNREALIZED LOSSES	(9)	(28)
FAIR VALUE	15,455	52,086
Total cash, cash equivalents and investments, amortized cost	286,112	249,683
Total cash, cash equivalents and investments, fair value	286,103	249,655
Commercial paper
Investments:
AMORTIZED COST	9,991	30,883
GROSS UNREALIZED GAINS	0	0
GROSS UNREALIZED LOSSES	0	0
FAIR VALUE	9,991	30,883
Corporate bonds
Investments:
AMORTIZED COST	5,473	21,231
GROSS UNREALIZED GAINS	0	0
GROSS UNREALIZED LOSSES	(9)	(28)
FAIR VALUE	5,464	21,203
Cash and money market funds
Cash and cash equivalents:
AMORTIZED COST	270,648	197,569
FAIR VALUE	$ 270,648	$ 197,569

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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