Summary of Significant Accounting Policies and Basis of Presentation - Description of Business (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014 segment	Dec. 31, 2014 segment country	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash and Cash Equivalents [Line Items]
Number of countries in which services are provided to clients (more than)		30
Number of new segments previously reported as New Services	2
Cash and cash equivalents		$ 25,735,000	$ 43,700,000	$ 37,806,000	$ 20,337,000
Short-term investments		12,200,000	24,600,000
Number of operating segments		4
Foreign banks [Member]
Cash and Cash Equivalents [Line Items]
Short-term investments		2,500,000	4,400,000
United States [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents		10,200,000
Canada [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents		4,900,000
Other Foreign Jurisdictions [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents		$ 10,600,000