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Summary of Significant Accounting Policies - Schedule of Revenue and Accounts Receivable for Each Significant Customer (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Allowance for Trade Receivables |  |  |  |  |
Accounts Receivable |  |  |  |  |
Accounts receivable allowance | $ 0 |  | $ 0 |  | $ 0
Revenue | Customer Concentration Risk | Customer A |  |  |  |  |
Accounts Receivable |  |  |  |  |
Concentration risk percentage |  |  | 20.00% |  |
Revenue | Customer Concentration Risk | Customer A | Maximum |  |  |  |  |
Accounts Receivable |  |  |  |  |
Concentration risk percentage | 10.00% | 10.00% |  | 10.00% |
Revenue | Customer Concentration Risk | Customer B |  |  |  |  |
Accounts Receivable |  |  |  |  |
Concentration risk percentage | 14.00% | 17.00% | 14.00% | 14.00% |
Revenue | Customer Concentration Risk | Customer C |  |  |  |  |
Accounts Receivable |  |  |  |  |
Concentration risk percentage |  | 15.00% |  | 16.00% |
Revenue | Customer Concentration Risk | Customer C | Maximum |  |  |  |  |
Accounts Receivable |  |  |  |  |
Concentration risk percentage | 10.00% |  | 10.00% |  |
Revenue | Customer Concentration Risk | Customer D |  |  |  |  |
Accounts Receivable |  |  |  |  |
Concentration risk percentage | 19.00% |  | 13.00% |  |
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 |  |  |  | 11.00% |
Revenue | Customer Concentration Risk | Customer E | Maximum |  |  |  |  |
Accounts Receivable |  |  |  |  |
Concentration risk percentage | 10.00% | 10.00% | 10.00% |  |
Revenue | Customer Concentration Risk | Customer F | Maximum |  |  |  |  |
Accounts Receivable |  |  |  |  |
Concentration risk percentage | 10.00% | 10.00% | 10.00% | 10.00% |
Accounts Receivable, net | Customer Concentration Risk | Customer A | Maximum |  |  |  |  |
Accounts Receivable |  |  |  |  |
Concentration risk percentage |  |  | 10.00% |  | 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 |  |  | 17.00% |  | 11.00%
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% |  |
Accounts Receivable, net | Customer Concentration Risk | Customer F |  |  |  |  |
Accounts Receivable |  |  |  |  |
Concentration risk percentage |  |  |  |  | 15.00%
Accounts Receivable, net | Customer Concentration Risk | Customer F | Maximum |  |  |  |  |
Accounts Receivable |  |  |  |  |
Concentration risk percentage |  |  | 10.00% |  |

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