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Fair Value Measurement - Summary of Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	$ 24,389	$ 73,537
Available for sale securities, contractual maturities between 1 to 5 years	196,990	171,655
Available for sale securities, contractual maturities between 5 to 10 years	55,605	52,693
Available for sale securities, contractual maturities after 10 years		6,577
Available for sale securities, contractual maturities, Total	276,984	304,462
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	14,183	5,426
Available for sale securities, contractual maturities between 1 to 5 years	144,894	153,567
Available for sale securities, contractual maturities between 5 to 10 years	22,735	19,102
Available for sale securities, contractual maturities after 10 years		6,577
Available for sale securities, contractual maturities, Total	181,812	184,672
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	4,919	32,466
Available for sale securities, contractual maturities between 1 to 5 years	40,240	13,723
Available for sale securities, contractual maturities, Total	45,159	46,189
U.S. Government Agency Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	4,788	65
Available for sale securities, contractual maturities between 1 to 5 years	7,031	4,355
Available for sale securities, contractual maturities between 5 to 10 years	32,870	33,591
Available for sale securities, contractual maturities, Total	44,689	38,011
Commercial Paper [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year		18,973
Available for sale securities, contractual maturities, Total		18,973
Supranational [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities between 1 to 5 years	4,741
Available for sale securities, contractual maturities, Total	4,741
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	449	16,139
Available for sale securities, contractual maturities, Total	449	16,139
Asset Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities between 1 to 5 years	84	10
Available for sale securities, contractual maturities, Total	84	10
Municipal Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	50	468
Available for sale securities, contractual maturities, Total	$ 50	$ 468

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