Other Long-Term Assets - Other Long-Term Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Other Assets Noncurrent Disclosure [Abstract]
Deferred costs	$ 800	$ 900
Prepaid commissions	1,000	1,200
Deferred tax asset	100	100
Other	300	300
Total	$ 2,226	$ 2,467