Income Taxes - Significant Components of the Company's Net Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Net operating loss carryforwards	$ 1,434	$ 953
Capital losses	46
Deferred revenue	917	525
Accruals and allowances	602	475
Intangible asset amortization	84	660
Stock-based compensation	5,835	6,988
Deferred rent expense	1,202	1,300
Gross deferred tax assets	10,120	10,901
Less valuation allowance	(1,158)	(1,058)
Total deferred tax assets	8,962	9,843
Deferred tax liabilities:
Intangible asset amortization	(734)	(701)
Depreciation	(2,545)	(1,525)
Total deferred tax liabilities	(3,279)	(2,226)
Net deferred tax assets	5,683	7,617
As reported:
Current deferred tax assets	555	862
Non-current deferred tax assets	5,873	7,457
Non-current deferred tax liabilities	$ (745)	$ (702)