Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Accounts receivable	$ 618	$ 1,034
Accrued liabilities	2,571	5,747
Equity-based compensation	3,732	5,535
Capitalized costs	595	861
Accrued sales taxes	257	439
Deferred rent	336	939
State tax credits	5,870	4,650
Foreign subsidiary net operating losses	278	212
Valuation allowance	(4,084)	(4,031)
Other	297	805
Deferred Tax Assets, Net of Valuation Allowance, Total	10,470	16,191
Deferred tax liabilities:
Intangible assets	7,480	11,056
Depreciation	1,182	2,321
Deferred Tax Liabilities, Net, Total	8,662	13,377
Net deferred tax assets	$ 1,808	$ 2,814