Borrowings (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Summary of Carrying Amount of Borrowings

Carrying amount of borrowings consist of the following (in thousands):

	December 31,
	2021		2020
Senior convertible notes	$	223,944	$	—
Mann Group promissory notes(1)		18,425		63,027
MidCap credit facility		38,833		49,335
2024 convertible notes		—		5,000
PPP Loan		—		4,873
Total debt — net carrying amount	$	281,202	$	122,235

Schedule of Line of Credit Facility Debt and Key Terms

The following table provides a summary of the Company’s debt and key terms:

	Amount Due				Terms
	December 31, 2021		December 31, 2020		Annual Interest Rate		Maturity Date		Conversion Price
Senior convertible notes	$230.0 million			—	2.50%		March 2026		$5.21 per share
MidCap credit facility(1)	$40.0 million		$50.0 million		one-month LIBOR (1% floor) plus 6.25%	(1)	August 2025	(1)	N/A
Mann Group convertible note	$18.4 million (plus $0.4 million accrued interest paid-in-kind)		$28.0 million (plus $0.6 million accrued interest paid-in-kind)		2.50%	(2)	December 2025	(2)	$2.50 per share
Mann Group non-convertible note(3)		—	$35.1 million (plus $3.6 million accrued interest paid-in-kind)		7.00%		November 2024		N/A
PPP loan(4)		—	$4.9 million		0.98%		April 2022		N/A
2024 convertible notes(5)		—	$5.0 million		5.75%		November 2024		$3.00 per share

Schedule of Maturities of Our Borrowings

The maturities of our borrowings as of December 31, 2021 are as follows (in thousands):

	Amounts
2022	$	—
2023		6,667
2024		20,000
2025		31,758
Thereafter		230,000
Total principal payments		288,425
Unamortized discount		(1,167	)
Debt issuance costs		(6,056	)
Total debt	$	281,202

Schedule of Amortization of Premium and Accretion of Debt Issuance Costs

Amortization of the premium and accretion of debt issuance costs related to all borrowings for the years ended December 31, 2021 and 2020 are as follows (in thousands):

	Year Ended December 31,
	2021		2020
Amortization of debt discount		377		268
Amortization of debt issuance cost		1,215		101