Commitments and Contingencies - Minimum Rental Commitments Less Imputed Interest (Details) $ in Thousands |
Jun. 30, 2019
USD ($)
|
|---|---|
| Lessee, Lease, Description [Line Items] | |
| Remainder of 2019 | $ 1,169 |
| 2020 | 2,337 |
| 2021 | 2,336 |
| 2022 | 2,262 |
| 2023 | 2,255 |
| Thereafter | 7,285 |
| Total | 17,644 |
| Less: imputed interest | (9,666) |
| Total operating lease liabilities | 7,978 |
| Ground Leases | |
| Lessee, Lease, Description [Line Items] | |
| Remainder of 2019 | 124 |
| 2020 | 247 |
| 2021 | 244 |
| 2022 | 163 |
| 2023 | 142 |
| Thereafter | 675 |
| Total | 1,595 |
| Less: imputed interest | (263) |
| Total operating lease liabilities | 1,332 |
| Office and Equipment Leases | |
| Lessee, Lease, Description [Line Items] | |
| Remainder of 2019 | 1,045 |
| 2020 | 2,090 |
| 2021 | 2,092 |
| 2022 | 2,099 |
| 2023 | 2,113 |
| Thereafter | 6,610 |
| Total | 16,049 |
| Less: imputed interest | (9,403) |
| Total operating lease liabilities | $ 6,646 |