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Investments - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	$ 66,690,000	$ 14,482,000	$ 13,742,000	$ 6,818,000
Investments	25,293,000
Held-to-maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investments	$ 25,300,000	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	$ 57,100,000	$ 0.0

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