Income Taxes - Summary of Company's Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets
Capital loss carryforwards	$ 7,294	$ 7,428
Stock compensation expense	9,115	7,266
Other	3,745	3,482
Total deferred tax assets	22,734	21,278
Valuation allowance	(7,294)	(7,428)	$ (7,743)	$ (727)
Net deferred tax assets	15,440	13,850
Deferred tax liabilities
Depreciation and amortization	(1,953)	(2,461)
Capitalized software development costs	(4,344)	(4,495)
Intangible assets	(1,310)	(1,854)
Deferred tax assets, net	7,833	5,040
US Country [Member]
Deferred tax assets
U.S. net operating loss carryforwards	$ 2,580	$ 3,102