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Leases (Tables) | 12 Months Ended
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Dec. 31, 2021
Leases |
Schedule of operating and finance lease right-of-use assets and related lease obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | December 31, | ​ | December 31, | ​ | ​ | ​
Leases | Classification | ​ | 2021 |  | 2020 |  |  | ​
Assets | ​ | ​ | (in thousands) | ​ |  | ​
Operating leases | Operating lease assets | ​ | $ | 9,242 | ​ | $ | 4,542 | ​ | ​ | ​
Finance lease | Finance lease assets * | ​ |  | 19,238 | ​ |  | 20,544 | ​ | ​ | ​
Total leased assets | ​ | ​ | $ | 28,480 | ​ | $ | 25,086 | ​ | ​ | ​
Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating | Other current liabilities | ​ | $ | 4,716 | ​ | $ | 2,573 | ​ | ​ | ​
Finance | Current portion of finance lease obligation | ​ | ​ | 979 | ​ | ​ | 756 | ​ | ​ | ​
Noncurrent | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating | Other long-term liabilities | ​ | ​ | 4,357 | ​ | ​ | 1,949 | ​ | ​ | ​
Finance | Finance lease obligation | ​ |  | 46,415 | ​ |  | 47,393 | ​ | ​ | ​
Total lease liabilities | ​ | ​ | $ | 56,467 | ​ | $ | 52,671 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
* Finance lease assets are recorded net of accumulated depreciation of $48.6 million and includes $0.7 million of prepaid financing costs as of December 31, 2021. Finance lease assets are recorded net of accumulated depreciation of $48.4 million and includes $0.7 million of prepaid financing costs as of December 31, 2020. ​ | ​ | ​ | ​
Schedule of lease costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Year ended |  | ​
​ | ​ | ​ | ​ | December 31, | ​ | ​
Lease cost | Classification | ​ |  | 2021 |  | 2020 |  | 2019 |  | ​
Operating lease cost | ​ | ​ | ​ | (in thousands) |  | ​
Service | Cost of revenue | ​ | ​ | $ | 2,978 | ​ | $ | 2,402 | ​ | $ | 2,315 | ​ | ​
Research and development | Operating expenses | ​ | ​ |  | 430 | ​ |  | 491 | ​ |  | 313 | ​ | ​
Sales and marketing* | Operating expenses | ​ | ​ |  | 1,605 | ​ |  | 1,389 | ​ |  | 1,378 | ​ | ​
General and administrative* | Operating expenses | ​ | ​ |  | 996 | ​ |  | 877 | ​ |  | 788 | ​ | ​
Total operating lease cost | ​ | ​ | ​ | $ | 6,009 | ​ | $ | 5,159 | ​ | $ | 4,794 | ​ | ​
Finance lease cost | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation of leased assets | Cost of revenue, R&D, Sales and marketing and G&A | ​ | ​ | $ | 1,306 | ​ | $ | 1,336 | ​ | $ | 1,348 | ​ | ​
Interest on lease liabilities | Interest expense | ​ | ​ |  | 5,086 | ​ |  | 5,211 | ​ |  | 5,155 | ​ | ​
Total finance lease cost | ​ | ​ | ​ | $ | 6,392 | ​ | $ | 6,547 | ​ | $ | 6,503 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total lease cost | ​ | ​ | ​ | $ | 12,401 | ​ | $ | 11,706 | ​ | $ | 11,297 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
* Sales and marketing and general and administrative expense also includes short-term lease and variable lease costs of approximately $1.9 million, $1.2 million and $0.9 million for the twelve months ended December 31, 2021, 2020 and 2019, respectively. | ​ | ​ | ​ | ​ | ​
Schedule of future minimum operating and finance leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Finance | ​ | Operating |  | Total |
Maturity of Lease Liabilities | ​ | Leases | ​ | Leases | ​ | Leases | ​
​ | ​ | (in thousands) | ​
2022 | ​ | $ | 5,980 | ​ | $ | 4,939 | ​ | $ | 10,919 | ​
2023 | ​ |  | 6,114 | ​ |  | 2,610 | ​ |  | 8,724 | ​
2024 | ​ |  | 6,252 | ​ |  | 902 | ​ |  | 7,154 | ​
2025 | ​ |  | 5,930 | ​ |  | 700 | ​ |  | 6,630 | ​
2026 | ​ | ​ | 6,008 | ​ | ​ | 464 | ​ | ​ | 6,472 | ​
Thereafter | ​ | ​ | 67,715 | ​ | ​ | 73 | ​ | ​ | 67,788 | ​
Total lease payments | ​ | $ | 97,999 | ​ | $ | 9,688 | ​ | $ | 107,687 | ​
Less interest portion* | ​ | ​ | (50,605) | ​ | ​ | (615) | ​ | ​ | (51,220) | ​
Finance lease and operating lease obligations | ​ | $ | 47,394 | ​ | $ | 9,073 | ​ | $ | 56,467 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
* 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 | ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
Lease term and discount rate |  | 2021 | ​
Weighted-average remaining lease term (years): | ​ | ​ | ​ | ​
Operating leases | ​ | ​ | 2.6 | ​
Finance leases | ​ |  | 15.1 | ​
Weighted-average discount rate: | ​ | ​ | ​ | ​
Operating leases | ​ |  | 4.5% | ​
Finance leases | ​ |  | 10.5% | ​
​ | ​ | ​ | ​ | ​
Schedule of cash outflows by lease type | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, | ​
Cash paid for amounts included in the measurement of lease liabilities |  | 2021 |  | 2020 |  | 2019 | ​
​ | ​ | (in thousands) | ​
Operating cash outflows from operating leases | ​ | $ | 6,009 | ​ | $ | 5,159 | ​ | $ | 4,794 | ​
Operating cash outflows from finance leases | ​ |  | 5,086 | ​ |  | 5,321 | ​ |  | 5,594 | ​
Financing cash outflows from finance leases | ​ |  | 763 | ​ |  | 399 | ​ |  | — | ​
Operating lease assets obtained in exchange for operating lease liabilities | ​ |  | 8,670 | ​ |  | 2,369 | ​ |  | 5,849 | ​
Finance lease assets obtained in exchange for new finance lease liabilities | ​ |  | — | ​ |  | — | ​ |  | — | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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