Summary of Significant Accounting Policies - Concentration of Credit Risk - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) Client	Dec. 31, 2014 USD ($) Client	Dec. 31, 2013 Client
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Federal Deposit Insurance Corporation | $	$ 250,000
Money Market Funds [Member]
Summary Of Significant Accounting Policies [Line Items]
Interest bearing money market fund | $	$ 13,700,000	$ 13,700,000
Total Revenue [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of clients | Client	3	3	4
Total Revenue [Member] | Credit Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	10.00%	10.00%	10.00%
Total Gross Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of clients | Client	2	2
United Health Care Services Inc [Member] | Total Revenue [Member] | Credit Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	31.00%	25.00%	11.00%
United Health Care Services Inc [Member] | Total Gross Accounts Receivable [Member] | Credit Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	46.00%	41.00%
Progressive Casualty Insurance Company [Member] | Total Revenue [Member] | Credit Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	15.00%	20.00%	15.00%
CVS Caremark Corporation [Member] | Total Revenue [Member] | Credit Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	13.00%
CVS Caremark Corporation [Member] | Total Gross Accounts Receivable [Member] | Credit Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	19.00%
Health Care Service Corporation [Member] | Total Revenue [Member] | Credit Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		11.00%
Vangent Inc [Member] | Total Revenue [Member] | Credit Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage			21.00%
Allstate Insurance Company [Member] | Total Revenue [Member] | Credit Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage			13.00%
CVS Pharmacy Inc [Member] | Total Gross Accounts Receivable [Member] | Credit Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		19.00%