Income Taxes - Summary of Company's Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Capital loss carryforwards		$ 4,648
Stock compensation expense	$ 4,967	4,534
Other	2,966	1,143
Total deferred tax assets	8,536	11,197
Valuation allowance		(4,648)	$ (7,235)	$ (7,294)
Net deferred tax assets	8,536	6,549
Deferred tax liabilities:
Depreciation and amortization	(1,847)	(1,369)
Capitalized software development costs	(3,776)	(3,479)
Intangible assets	(898)	(967)
Deferred tax assets, net	2,015	734
US Country [Member]
Deferred tax assets:
U.S. net operating loss carryforwards	$ 603	$ 872