Fair Value Accounting - Financial Assets by Major Security Type and Contingent Consideration Liability Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents, fair value disclosure	$ 4,408	$ 6,806
Total assets	4,408	6,806
Liabilities
Contingent consideration liability	2,600	2,800
Total liabilities	2,600	2,800
Money Market Funds [Member]
Assets
Cash and cash equivalents, fair value disclosure	4,408	6,806
Level 1 [Member]
Assets
Total assets	4,408	6,806
Liabilities
Contingent consideration liability	0	0
Total liabilities	0	0
Level 1 [Member] | Money Market Funds [Member]
Assets
Cash and cash equivalents, fair value disclosure	4,408	6,806
Level 2 [Member]
Assets
Total assets	0	0
Liabilities
Contingent consideration liability	0	0
Total liabilities	0	0
Level 2 [Member] | Money Market Funds [Member]
Assets
Cash and cash equivalents, fair value disclosure	0	0
Level 3 [Member]
Assets
Total assets	0	0
Liabilities
Contingent consideration liability	2,600	2,800
Total liabilities	2,600	2,800
Level 3 [Member] | Money Market Funds [Member]
Assets
Cash and cash equivalents, fair value disclosure	$ 0	$ 0