Debt - Additional Information (Detail)	1 Months Ended					2 Months Ended	12 Months Ended	14 Months Ended
	Jul. 31, 2015 USD ($)	Sep. 30, 2013 USD ($)	Dec. 31, 2012 USD ($) Installment	Dec. 31, 2011 USD ($) Installment	Jan. 31, 2011 USD ($) Installment	Oct. 31, 2016 Installment Lease	Dec. 31, 2016 USD ($)	Sep. 30, 2016 Installment Lease	Dec. 31, 2015 USD ($)	Feb. 28, 2015 USD ($)	Dec. 31, 2014 USD ($)	Feb. 28, 2013 Installment
Line of Credit Facility [Line Items]
Restrict from use in cash held at Silicon Valley Bank							$ 1,293,000		$ 0
SocialMoov loans [Member]
Line of Credit Facility [Line Items]
Loans payables										$ 1,043,000
Capital Lease for Acquisition of Computer Equipment [Member]
Line of Credit Facility [Line Items]
Effective annual interest rate						5.20%		5.70%				6.00%
Number of monthly installments | Installment						48		48				36
Capital lease arrangement maturity, month and year							2016-02
Number of capital lease arrangements | Lease						2		7
Net book value of equipment under capital leases							$ 3,158,000		2,446,000
Remaining principal balance payable							$ 3,411,000		$ 2,700,000
Equipment Advance Facilities [Member]
Line of Credit Facility [Line Items]
Increase in the revolving credit facility					$ 2,000,000
Revolving credit facility, amended annual interest rate					5.50%
Frequency of payments, description							Repayable in 36 consecutive monthly installments of principal and interest
Number of monthly installments | Installment					36
Revolving credit facility, the expiration date					Dec. 01, 2014
Additional Equipment Advance Facility [Member]
Line of Credit Facility [Line Items]
Increase in the revolving credit facility				$ 2,000,000
Revolving credit facility, amended annual interest rate				5.50%
Frequency of payments, description							Repayable in 36 consecutive monthly installments of principal and interest.
Number of monthly installments | Installment				36
Revolving credit facility, the expiration date				Sep. 01, 2015
Supplemental Equipment Advance [Member]
Line of Credit Facility [Line Items]
Increase in the revolving credit facility			$ 3,000,000
Revolving credit facility, amended annual interest rate			3.00%
Frequency of payments, description							Repayable in 33 consecutive monthly installments of principal and interest
Number of monthly installments | Installment			33
Revolving credit facility, the expiration date			Mar. 01, 2016
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Increase in the revolving credit facility	$ 20,000,000	$ 15,000,000
Revolving credit facility, amended annual interest rate	2.75%	0.25%
Revolving credit facility, the expiration date	Jul. 31, 2017	Jul. 31, 2015
Percentage of eligible accounts receivable	80.00%	80.00%
Unrestricted cash balance exceeds		$ 50,000,000
Revolving credit facility, Description							In September 2013, the Company entered into an amendment to the Revolving Credit Facility pursuant to which Silicon Valley Bank agreed to increase the Revolving Credit Facility to the lesser of $15,000 or 80% of the Company’s eligible accounts receivable.
Revolving credit facility, amount outstanding							$ 0
Line of credit facility termination month and year							2016-12
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Increase in the revolving credit facility											$ 1,293,000
Restrict from use in cash held at Silicon Valley Bank							$ 1,293,000