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Investments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	$ 62,510,000	$ 14,482,000	$ 6,818,000	$ 10,761,000
Investments	30,053,000
Held-to-Maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investments	$ 30,100,000	0
Investment maturity	One year or less
Money Market Funds [Member] | Level 1 [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	$ 55,600,000	$ 0.0

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