Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Abstract]
Cash	$ 9,456	$ 1,666
Money market	44,055	36,783
Total cash and cash equivalents	$ 53,511	$ 38,449	$ 28,376	$ 34,766