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Commitments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2019
Commitments And Contingencies Disclosure [Abstract] |
Components of Lease Cost for Operating and Finance Leases | The components of lease cost for operating and finance leases for the three months ended March 31, 2019 were:
Operating leases |  | $ (in thousands) |
Operating lease cost |  | $ | 694 |
Variable lease cost |  |  | 263 |
|  |  | 957 |
Short-term lease cost |  |  | 119 |
Finance leases |  |  |  |
Depreciation on finance leases |  |  | 47 |
Interest on finance leases |  |  | 7 |
|  |  | 54 |
Total lease cost |  | $ | 1,130 |
Summary of Weighted Average Remaining Lease Term and Weighted Average Discount Rate for Operating and Finance Leases | The weighted average remaining lease term and the weighted average discount rate for operating and finance leases at March 31, 2019 was:
|  | Operating Lease |  | Finance Leases |
Weighted average discount rate |  |  | 9.0 | % |  | 5.9 | %
Weighted average remaining lease term (years) |  | 9.4 |  | 1.5 |
Summary of Maturity of Lease Liabilities for Operating and Finance Leases | The following table reconciles the undiscounted cash flows for the operating and finance leases at March 31, 2019 to the operating and finance lease liabilities recorded on the balance sheet:
Maturity of lease liabilities |  | Operating Lease |  | Finance Leases |
|  | (in thousands) |
2019 |  | $ | 2,390 |  | $ | 215 |
2020 |  |  | 3,270 |  |  | 214 |
2021 |  |  | 3,369 |  |  | 2 |
2022 |  |  | 3,470 |  |  | - |
2023 |  |  | 3,574 |  |  | - |
Thereafter |  |  | 18,067 |  |  | - |
Total lease payments |  |  | 34,140 |  |  | 431 |
Less: imputed interest |  |  | 10,449 |  |  | 21 |
Total lease liabilities |  | $ | 23,691 |  | $ | 410 |
Current lease liabilities |  |  | 1,374 |  |  | 269 |
Long-term lease liabilities |  |  | 22,317 |  |  | 141 |
Schedule of Aggregate Future Lease Payments for Operating and Capital Leases | The aggregate future lease payments for operating and capital leases as of December 31, 2018 are as follows:
|  | Operating lease |  |  | Capital leases |
|  | (in thousands) |
2019 |  | $ | 3,175 |  |  | $ | 287 |
2020 |  |  | 3,270 |  |  |  | 214 |
2021 |  |  | 3,369 |  |  |  | 2 |
2022 |  |  | 3,470 |  |  |  | — |
2023 |  |  | 3,574 |  |  |  | — |
Thereafter |  |  | 18,067 |  |  |  | — |
Total future minimum lease payments |  | $ | 34,925 |  |  | $ | 503 |
Less amounts representing interest |  |  |  |  |  |  | 27 |
Capital lease obligations at December 31, 2018 |  |  |  |  |  |  | 476 |
Less current portion of capital lease obligations |  |  |  |  |  |  | 266 |
Capital lease obligations, net of current portion |  |  |  |  |  | $ | 210 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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