Summary of Significant Accounting Policies - Schedule of Revenue and Accounts Receivable for Each Significant Customer (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Allowance for Trade Receivables
Accounts Receivable
Accounts receivable allowance	$ 0		$ 0
Revenue | Customer Concentration Risk | Customer A
Accounts Receivable
Concentration risk percentage	34.00%
Revenue | Customer Concentration Risk | Customer A | Maximum
Accounts Receivable
Concentration risk percentage		10.00%
Revenue | Customer Concentration Risk | Customer B
Accounts Receivable
Concentration risk percentage	13.00%	10.00%
Revenue | Customer Concentration Risk | Customer C
Accounts Receivable
Concentration risk percentage		18.00%
Revenue | Customer Concentration Risk | Customer C | Maximum
Accounts Receivable
Concentration risk percentage	10.00%
Revenue | Customer Concentration Risk | Customer D | Maximum
Accounts Receivable
Concentration risk percentage	10.00%	10.00%
Revenue | Customer Concentration Risk | Customer E
Accounts Receivable
Concentration risk percentage		13.00%
Revenue | Customer Concentration Risk | Customer E | Maximum
Accounts Receivable
Concentration risk percentage	10.00%
Accounts Receivable, net | Customer Concentration Risk | Customer A
Accounts Receivable
Concentration risk percentage	54.00%
Accounts Receivable, net | Customer Concentration Risk | Customer A | Maximum
Accounts Receivable
Concentration risk percentage			10.00%
Accounts Receivable, net | Customer Concentration Risk | Customer B | Maximum
Accounts Receivable
Concentration risk percentage	10.00%		10.00%
Accounts Receivable, net | Customer Concentration Risk | Customer C | Maximum
Accounts Receivable
Concentration risk percentage	10.00%		10.00%
Accounts Receivable, net | Customer Concentration Risk | Customer D
Accounts Receivable
Concentration risk percentage			15.00%
Accounts Receivable, net | Customer Concentration Risk | Customer D | Maximum
Accounts Receivable
Concentration risk percentage	10.00%
Accounts Receivable, net | Customer Concentration Risk | Customer E
Accounts Receivable
Concentration risk percentage			10.00%
Accounts Receivable, net | Customer Concentration Risk | Customer E | Maximum
Accounts Receivable
Concentration risk percentage	10.00%