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Fair Value of Financial Instruments - Schedule of Debt (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Jan. 23, 2022 | Aug. 02, 2021 | Nov. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |
Par Value | $ 90,578,000 | $ 72,416,000 |  |  |
Carrying Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 100,032,000 | 71,047,000 |  |  |
Fair Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 121,050,000 | 99,432,000 |  |  |
Bridge Loans |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Par Value | 25,000,000 | 0 |  |  |
Debt | 35,655,000 | 0 | $ 25,000,000 |  |
Bridge Loans | Carrying Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 35,655,000 | 0 |  |  |
Bridge Loans | Fair Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 35,655,000 | 0 |  |  |
Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Par Value | 55,578,000 | 55,578,000 |  |  |
Convertible Debt | Carrying Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 54,271,000 | 54,160,000 |  |  |
Convertible Debt | Fair Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 75,599,000 | 82,481,000 |  |  |
Convertible Debt | 2014 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Par Value | 578,000 | 578,000 |  |  |
Convertible Debt | 2014 Notes | Carrying Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 568,000 | 568,000 |  |  |
Convertible Debt | 2014 Notes | Fair Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 601,000 | 601,000 |  |  |
Convertible Debt | 2019 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Par Value | 55,000,000 | 55,000,000 |  |  | $ 55,000,000
Convertible Debt | 2019 Notes | Carrying Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 53,703,000 | 53,592,000 |  |  |
Convertible Debt | 2019 Notes | Fair Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 74,998,000 | 81,880,000 |  |  |
Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Par Value | 10,000,000 | 10,000,000 |  | $ 10,000,000 |
Secured Debt | Carrying Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 10,106,000 | 10,049,000 |  |  |
Secured Debt | Fair Value |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | 9,796,000 | 10,113,000 |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Advances under revolving credit agreement | 0 | 6,838,000 |  |  |
Line of Credit | Carrying Value | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Advances under revolving credit agreement | 0 | 6,838,000 |  |  |
Line of Credit | Fair Value | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Advances under revolving credit agreement | $ 0 | $ 6,838,000 |  |  |

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