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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Rental Payments for Operating Leases | The following table summarizes the Company's principal contractual commitments as of December 31, 2018 (in thousands):
| Gross Operating Lease Commitments |  | Sublease Income |  | Net Operating Lease Commitments |  | Purchase Obligations |  | Total Commitments
2019 | $ | 5,492 |  |  | $ | (339 | ) |  | $ | 5,153 |  |  | $ | 387 |  |  | $ | 5,540 |
2020 | 4,081 |  |  | (344 | ) |  | 3,737 |  |  | 84 |  |  | 3,821 |
2021 | 3,195 |  |  | (351 | ) |  | 2,844 |  |  | — |  |  | 2,844 |
2022 | 2,365 |  |  | (357 | ) |  | 2,008 |  |  | — |  |  | 2,008 |
2023 | 2,066 |  |  | (271 | ) |  | 1,795 |  |  | — |  |  | 1,795 |
Thereafter | 1,187 |  |  | — |  |  | 1,187 |  |  | — |  |  | 1,187 |
Total | $ | 18,386 |  |  | $ | (1,662 | ) |  | $ | 16,724 |  |  | $ | 471 |  |  | $ | 17,195 |

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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