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v3.23.2

Convertible Debt - Narrative (Details) |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2019 USD ($) day $ / shares | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Jan. 01, 2022 USD ($) | Feb. 19, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Accumulated deficit |  | $ (1,564,031,634) |  | $ (1,564,031,634) |  | $ (1,487,847,784) |  |
Additional paid-in capital |  | (1,733,826,392) |  | (1,733,826,392) |  | $ (1,710,656,191) |  |
Non-cash interest expense |  | 313,488 | $ 313,488 | 626,976 | $ 626,976 |  |  |
Convertible senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Original principal amount |  | 78,500,000 |  | 78,500,000 |  |  |  |
Unamortized debt issuance cost |  | 62,329 |  | 62,329 |  |  |  |
Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  | $ 1,800,000 |
Additional paid-in capital |  |  |  |  |  |  | 3,300,000 |
Convertible senior notes |  |  |  |  |  |  | $ 1,500,000 |
Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance cost |  | $ 2,200,000 |  | $ 2,200,000 |  |  |  |
Convertible Debt | Convertible senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Original principal amount | $ 78,500,000 |  |  |  |  |  |  | $ 78,500,000
Stated interest rate | 6.50% | 6.50% |  | 6.50% |  |  |  | 6.50%
Proceeds from issuance of debt | $ 75,700,000 |  |  |  |  |  |  |
Debt instrument, convertible, conversion ratio | 0.1858045 |  |  |  |  |  |  |
Debt instrument, convertible conversion price (in dollars per share) | $ / shares | $ 5.38 |  |  |  |  |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger | 130.00% |  |  |  |  |  |  |
Debt instrument, convertible, threshold trading days | day | 20 |  |  |  |  |  |  |
Debt instrument, convertible, threshold consecutive trading days | day | 30 |  |  |  |  |  |  |
Debt instrument, redemption price percentage | 100.00% |  |  |  |  |  |  |
Debt instrument, unamortized discount | $ 16,300,000 |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 13.10% |  | 13.10% |  |  |  |
Unamortized debt issuance cost |  | $ 592,000 |  | $ 592,000 |  |  |  |
Non-cash interest expense |  | 313,000 | 627,000 | 313,000 | 627,000 |  |  |
Interest expense, contractual interest |  | $ 267,000 | $ 533,000 | $ 267,000 | $ 533,000 |  |  |

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