Summary of Significant Accounting Policies and Basis of Presentation - Description of Business (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) segment country	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Cash and Cash Equivalents [Line Items]
Contingent consideration, liability	$ 4,000,000	$ 0
Current portion of debt (Note 5)	$ 3,600,000	0
Number of countries in which services are provided to clients (more than) | country	30
Cash and cash equivalents	$ 15,723,000	15,122,000	$ 25,735,000	$ 43,700,000
Short-term investments	$ 2,200,000	4,500,000
Number of operating segments | segment	3
Foreign banks [Member]
Cash and Cash Equivalents [Line Items]
Short-term investments	$ 2,200,000	$ 3,200,000
United States [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	4,100,000
Canada [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	1,900,000
Other Foreign Jurisdictions [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 9,700,000