Nature of Business and Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016
Cash Equivalents [Member]
Summary Of Significant Accounting Policies [Line Items]
Liquid instrument maturity period	Three months or less
Short-term Investments [Member]
Summary Of Significant Accounting Policies [Line Items]
Liquid instrument maturity period	Over three months to one year