Summary of Significant Accounting Policies - Concentration of Revenue and Accounts Receivable (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue | Customer A
Concentration of Revenue and Accounts Receivable
Concentration risk percentage	36.00%	35.00%	13.00%
Revenue | Customer B
Concentration of Revenue and Accounts Receivable
Concentration risk percentage	11.00%	16.00%
Revenue | Customer C
Concentration of Revenue and Accounts Receivable
Concentration risk percentage	18.00%
Revenue | Customer E
Concentration of Revenue and Accounts Receivable
Concentration risk percentage			13.00%
Revenue | Customer F
Concentration of Revenue and Accounts Receivable
Concentration risk percentage			12.00%
Revenue | Customer G
Concentration of Revenue and Accounts Receivable
Concentration risk percentage		11.00%	17.00%
Accounts Receivable | Customer A
Concentration of Revenue and Accounts Receivable
Concentration risk percentage		48.00%	54.00%
Accounts Receivable | Customer B
Concentration of Revenue and Accounts Receivable
Concentration risk percentage			14.00%
Accounts Receivable | Customer C
Concentration of Revenue and Accounts Receivable
Concentration risk percentage		16.00%
Accounts Receivable | Customer D
Concentration of Revenue and Accounts Receivable
Concentration risk percentage		13.00%
Accounts Receivable | Customer F
Concentration of Revenue and Accounts Receivable
Concentration risk percentage			11.00%