Summary of Significant Accounting Policies - Concentration of Revenue and Accounts Receivable (Details) - Customer concentration	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue | Customer A
Concentration of Revenue and Accounts Receivable
Concentration risk percentage	17.00%	36.00%	35.00%
Revenue | Customer B
Concentration of Revenue and Accounts Receivable
Concentration risk percentage	10.00%	11.00%	16.00%
Revenue | Customer C
Concentration of Revenue and Accounts Receivable
Concentration risk percentage	10.00%	18.00%
Revenue | Customer D
Concentration of Revenue and Accounts Receivable
Concentration risk percentage	38.00%
Revenue | Customer G
Concentration of Revenue and Accounts Receivable
Concentration risk percentage			11.00%
Accounts Receivable | Customer A
Concentration of Revenue and Accounts Receivable
Concentration risk percentage		48.00%
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	69.00%	13.00%
Accounts Receivable | Customer I
Concentration of Revenue and Accounts Receivable
Concentration risk percentage	14.00%