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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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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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