Organization and Summary of Significant Accounting Policies Organization and Summary of Significant Accounting Policies - Concentration of Credit Risk (Detail) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Revenue, Percentage | 100.00% | 100.00% | 100.00% |
| Customer [Member] | |||
| Concentration Risk, Percentage | 10.00% | ||
| Entity Wide Accounts Receivable By Major Customer Percentage | 13.00% | 22.00% | |
| Customer B [Member] | |||
| Entity Wide Accounts Receivable By Major Customer Percentage | 19.00% | 18.00% | |
| Byram [Member] | |||
| Concentration Risk, Percentage | 14.00% | 17.00% | 18.00% |
| Edgepark [Member] | |||
| Concentration Risk, Percentage | 17.00% | 16.00% | 16.00% |
| Individual Country [Member] | Maximum [Member] | |||
| Revenue, Percentage | 10.00% | 10.00% | 10.00% |