Customer Concentration	9 Months Ended
Customer Concentration	Sep. 30, 2015
Customer Concentration [Abstract]
Customer Concentration	13. Customer Concentration The Company's revenues were historically highly dependent on two customers: LinkedIn and the Apollo Group. The Company's agreement with LinkedIn terminated on March 29, 2014 and its agreement with the Apollo Group terminated on October 9, 2014. No individual customers accounted for more than 10% of revenues during the three and nine months ended September 30, 2015. During the three months ended September 30, 2014, Apollo Group accounted for 22% of the Company's revenues. During the nine months ended September 30, 2014, LinkedIn and Apollo Group accounted for 13% and 27%, respectively, of the Company's revenues. At September 30, 2015, no single customer accounted for 10% or more of the Company's accounts receivable. At December 31, 2014, two customers accounted for 15% and 12% of the Company's accounts receivable.