Income Taxes - Summary of Company's Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets
Capital loss carryforwards	$ 7,235	$ 7,294
Stock compensation expense	11,307	9,115
Other	1,468	3,745
Total deferred tax assets	21,919	22,734
Valuation allowance	(7,235)	(7,294)	$ (7,428)	$ (7,743)
Net deferred tax assets	14,684	15,440
Deferred tax liabilities
Depreciation and amortization	(1,456)	(1,953)
Capitalized software development costs	(4,923)	(4,344)
Intangible assets	(1,037)	(1,310)
Deferred tax assets, net	7,268	7,833
US Country [Member]
Deferred tax assets
U.S. net operating loss carryforwards	$ 1,909	$ 2,580