Commitments and Contingencies - Leased Space (Details) |
Dec. 31, 2016
ft²
|
|---|---|
| Office space in Austin, TX | |
| Lease obligations | |
| Leased area of office space (in square feet) | 43,000 |
| Office space in Oklahoma City, Oklahoma | |
| Lease obligations | |
| Leased area of office space (in square feet) | 5,500 |