Summary of Significant Accounting Policies - (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014 Segment	Mar. 31, 2013	Dec. 31, 2013
Accounting Policies [Line Items]
Realized gains or losses on available-for-sale securities	$ 0	$ 0
Unrealized gains or losses	0		0
Other than temporary declines in investment value	0		0
Allowance for outstanding accounts receivable	421		556
Impairment of goodwill	0
Dividend yield	0.00%	0.00%
Foreign translation adjustment	$ 2,763		$ 1,729
Number of reporting segments	1
Stock Purchase Plan
Accounting Policies [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share		3
Stock Options
Accounting Policies [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share		335
Restricted Stock
Accounting Policies [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share		37
Furniture
Accounting Policies [Line Items]
Estimated useful life	7 years
Computer Software and Equipment | Minimum
Accounting Policies [Line Items]
Estimated useful life	3 years
Computer Software and Equipment | Maximum
Accounting Policies [Line Items]
Estimated useful life	5 years
Software Development Costs
Accounting Policies [Line Items]
Estimated useful life	3 years