Cash Equivalents and Investments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($) Investment	Dec. 31, 2015 USD ($)
Cash and Cash Equivalents [Abstract]
Maturity period available-for-sale securities	Less than two years
Significant realized gains or losses on available-for-sale securities	$ 0
Cash	$ 900,000	$ 1,500,000
Number of available-for-sale securities in a continuous unrealized loss position for more than 12 months | Investment	0