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Certain Relationships and Related Party Transactions (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jan. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Wipro
Related Party Transaction [Line Items]
Capitalized costs for internally developed software services received		$ 400,000		$ 1,500,000
Accounts payable, related parties		2,900,000		2,900,000		$ 2,200,000
Accounts receivable, related parties		0		0		$ 0
Wipro \| Agency Related Services
Related Party Transaction [Line Items]
Revenue from related parties		0	$ 15,000	0	$ 100,000
Wipro \| Technology Related Services
Related Party Transaction [Line Items]
Expenses from transactions with related party		$ 3,300,000	$ 2,500,000	$ 6,100,000	$ 2,900,000
Securities Purchase Agreement \| Series A Preferred Stock
Related Party Transaction [Line Items]
Number of shares issued (in shares)	9,926
Consideration received on transaction	$ 9,900,000
Securities Purchase Agreement \| Series A Preferred Stock \| Wipro
Related Party Transaction [Line Items]
Number of shares issued (in shares)	9,926
Consideration received on transaction	$ 9,900,000