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v3.20.2

Long-term debt - Subsequent Event (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 01, 2020 | Sep. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2020
Subsequent Event [Line Items] |  |  |  |
Shares issued |  | $ 46,323 | $ 56,528 |
Hercules |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Shares issued |  |  |  | $ 2,000
Hercules | Sales Agreement | Subsequent events |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Shares issued | $ 50,000 |  |  |
At the market offering |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Shares issued (in shares) |  |  |  | 2,830,713
Net proceeds |  |  |  | $ 46,300
At the market offering | Hercules | Sales Agreement | Subsequent events |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Shares issued (in shares) | 98,100 |  |  |
Share issue price | $ 19.05 |  |  |
Net proceeds | $ 1,800 |  |  |

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