Commitment and Contingencies (Details) (USD $)		9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2014 Accounts receivable Credit risk Customers item	Dec. 31, 2013 Accounts receivable Credit risk Customers item	Sep. 30, 2014 Accounts receivable Credit risk Customer one	Dec. 31, 2013 Accounts receivable Credit risk Customer one	Sep. 30, 2014 Accounts receivable Credit risk Customer two	Dec. 31, 2013 Accounts receivable Credit risk Customer two	Sep. 30, 2014 Accounts receivable Credit risk Customer three	Dec. 31, 2013 Accounts receivable Credit risk Customer three	Sep. 30, 2014 Accounts receivable Credit risk Customer four	Dec. 31, 2013 Accounts receivable Credit risk Customer four	Dec. 31, 2013 Accounts receivable Credit risk Customer five	Sep. 30, 2014 Revenues Customer concentration Customers item	Sep. 30, 2013 Revenues Customer concentration Customers item	Sep. 30, 2014 Revenues Customer concentration Customer one	Sep. 30, 2013 Revenues Customer concentration Customer one	Sep. 30, 2014 Revenues Customer concentration Customer two	Sep. 30, 2013 Revenues Customer concentration Customer three	Sep. 30, 2013 Revenues Customer concentration Customer four
Commitments and Contingencies
Letter of credit with Silicon Valley Bank	$ 525,000
Customer Concentration
Number of customers		4	3										2	4
Concentration risk (as a percent)		80.30%	78.30%	33.50%	30.80%	26.90%	26.90%	11.50%	10.20%	8.40%	5.80%	4.60%	36.60%	38.60%	24.90%	14.90%	11.70%	13.50%	10.20%