Significant Accounting Policies - Revenue Recognition (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2016 | |
| Minimum | |
| Summary of Significant Accounting Policies [Line Items] | |
| Duration of product sales projects | 3 months |
| Maximum | |
| Summary of Significant Accounting Policies [Line Items] | |
| Duration of product sales projects | 24 months |