Organization and Significant Accounting Policies - Certain Significant Risks and Uncertainties (Details) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Gross accounts receivable | One Customer | |||
| Certain Significant Risks and Uncertainties | |||
| Concentration risk (as a percent) | 0.00% | 0.00% | 35.00% |