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Leases (Tables) | 6 Months Ended
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Jun. 30, 2021
Leases |
Schedule of operating and finance lease right-of-use assets and related lease obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | June 30, | ​ | December 31,
Leases | Classification | ​ | 2021 |  | 2020
Assets | ​ | ​ | (in thousands)
Operating leases | Operating lease assets | ​ | $ | 7,626 | ​ | $ | 4,542
Finance lease | Finance lease assets * | ​ |  | 19,889 | ​ |  | 20,544
Total leased assets | ​ | ​ | $ | 27,515 | ​ | $ | 25,086
Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating | Other current liabilities | ​ | $ | 3,215 | ​ | $ | 2,573
Finance | Current portion of finance lease obligation | ​ | ​ | 864 | ​ | ​ | 756
Noncurrent | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating | Other long-term liabilities | ​ | ​ | 4,398 | ​ | ​ | 1,949
Finance | Finance lease obligation | ​ |  | 46,923 | ​ |  | 47,393
Total lease liabilities | ​ | ​ | $ | 55,400 | ​ | $ | 52,671
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
* Finance lease assets are recorded net of accumulated depreciation of $48.9 million and include $0.7 million of prepaid financing costs as of June 30, 2021. Finance lease assets are recorded net of accumulated depreciation of $48.4 million and include $0.7 million of prepaid financing costs as of December 31, 2020. ​
Schedule of lease costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three months ended | ​ | Six months ended |  | ​
​ | ​ | ​ | June 30, | ​ | June 30, | ​ | ​
Lease cost | Classification | ​ | 2021 |  | 2020 |  | 2021 |  | 2020 |  | ​
Operating lease cost | ​ | ​ | (in thousands) |  | ​
Service | Cost of revenue | ​ | $ | 644 | ​ | $ | 624 | ​ | $ | 1,283 | ​ | $ | 1,174 | ​ | ​
Research and development | Operating expenses | ​ |  | 122 | ​ |  | 128 | ​ |  | 252 | ​ |  | 209 | ​ | ​
Sales and marketing* | Operating expenses | ​ |  | 376 | ​ |  | 346 | ​ |  | 755 | ​ |  | 678 | ​ | ​
General and administrative* | Operating expenses | ​ |  | 201 | ​ |  | 220 | ​ |  | 461 | ​ |  | 435 | ​ | ​
Total operating lease cost | ​ | ​ | $ | 1,343 | ​ | $ | 1,318 | ​ | $ | 2,751 | ​ | $ | 2,496 | ​ | ​
Finance lease cost | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation of leased assets | Cost of revenue, R&D, Sales and marketing and G&A | ​ | $ | 328 | ​ | $ | 328 | ​ | $ | 656 | ​ | $ | 681 | ​ | ​
Interest on lease liabilities | Interest expense | ​ |  | 1,274 | ​ |  | 1,299 | ​ |  | 2,553 | ​ |  | 2,602 | ​ | ​
Total finance lease cost | ​ | ​ | $ | 1,602 | ​ | $ | 1,627 | ​ | $ | 3,209 | ​ | $ | 3,283 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total lease cost | ​ | ​ | $ | 2,945 | ​ | $ | 2,945 | ​ | $ | 5,960 | ​ | $ | 5,779 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
* Sales and marketing and general and administrative expense also includes short-term lease and variable lease costs of approximately $0.4 million and $0.9 million for the three and six months ended June 30, 2021, respectively, and includes short-term and variable lease costs of approximately $0.3 million and $0.5 million for the three and six months ended June 30, 2020, respectively. | ​ | ​
Schedule of future minimum operating and finance leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Finance | ​ | Operating |  | Total |
Maturity of Lease Liabilities | ​ | Leases | ​ | Leases | ​ | Leases | ​
​ | ​ | (in thousands) | ​
2021 | ​ | $ | 2,929 | ​ | $ | 1,827 | ​ | $ | 4,756 | ​
2022 | ​ |  | 5,980 | ​ |  | 3,053 | ​ |  | 9,033 | ​
2023 | ​ |  | 6,114 | ​ |  | 1,544 | ​ |  | 7,658 | ​
2024 | ​ |  | 6,252 | ​ |  | 794 | ​ |  | 7,046 | ​
2025 | ​ | ​ | 5,930 | ​ | ​ | 712 | ​ | ​ | 6,642 | ​
Thereafter | ​ | ​ | 73,723 | ​ | ​ | 545 | ​ | ​ | 74,268 | ​
Total lease payments | ​ | $ | 100,928 | ​ | $ | 8,475 | ​ | $ | 109,403 | ​
Less interest portion* | ​ | ​ | (53,141) | ​ | ​ | (862) | ​ | ​ | (54,003) | ​
Finance lease and operating lease obligations | ​ | $ | 47,787 | ​ | $ | 7,613 | ​ | $ | 55,400 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
* Finance lease interest calculated using the implied interest rate; operating lease interest calculated using estimated corporate borrowing rate. | ​
Schedule of weighted-average remaining lease term and discount rates | ​
​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​
Lease term and discount rate |  | 2021 | ​
Weighted-average remaining lease term (years): | ​ | ​ | ​ | ​
Operating leases | ​ | ​ | 3.0 | ​
Finance leases | ​ |  | 15.6 | ​
Weighted-average discount rate: | ​ | ​ | ​ | ​
Operating leases | ​ |  | 4.5% | ​
Finance leases | ​ |  | 10.5% | ​
​ | ​ | ​ | ​ | ​
Schedule of cash outflows by lease type | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended | ​
​ | ​ | June 30, | ​
Cash paid for amounts included in the measurement of lease liabilities |  | 2021 | ​ | 2020 | ​
​ | ​ | (in thousands) | ​
Operating cash outflows from operating leases | ​ | $ | 2,751 | ​ | $ | 2,496 | ​
Operating cash outflows from finance leases | ​ |  | 2,556 | ​ |  | 2,746 | ​
Financing cash outflows from finance leases | ​ | ​ | 362 | ​ | ​ | 108 | ​
Operating lease assets obtained in exchange for operating lease liabilities | ​ |  | 4,192 | ​ |  | 1,038 | ​
Finance lease assets obtained in exchange for new finance lease liabilities | ​ | $ | — | ​ | $ | — | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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