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Debt - Summary of total debt (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Total future principal payments | $ 8,785 | $ 29,420
Less: current portion of long-term debt | (1,550) | (4,381)
Long-term debt | 7,235 | 25,039
Notes payable to banks |  |
Debt Instrument [Line Items] |  |
Total future principal payments | $ 8,785 | 29,420
Notes payable to banks | Equipment Note 6 |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 2.89% |
Term (years) | 7 years |
Total future principal payments | $ 0 | 12,896
Notes payable to banks | Equipment Note 7 |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 3.09% |
Term (years) | 5 years |
Total future principal payments | $ 0 | 6,980
Notes payable to banks | Equipment Note 8 |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 2.75% |
Term (years) | 5 years |
Total future principal payments | $ 5,011 | 5,513
Notes payable to banks | Equipment Note 9 |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate (per annum) | 3.01% |
Term (years) | 7 years |
Total future principal payments | $ 3,774 | 4,031
Revolving loans |  |
Debt Instrument [Line Items] |  |
Term (years) | 5 years |
Total future principal payments | $ 0 | $ 0

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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