Borrowings (Tables)

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Summary of Carrying Amount of Borrowings

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

	March 31, 2020		December 31, 2019
Mann Group promissory notes	$	70,022	$	70,020
Midcap Credit Facility		38,893		38,851
Senior notes (2020 notes and 2024 convertible notes)		10,101		10,028
Total debt — net carrying amount	$	119,016	$	118,899

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
	March 31, 2020	December 31, 2019	Annual Interest Rate		Maturity Date	Conversion Price
Mann Group convertible    note	$35.0 million (plus $1.6 million accrued interest paid-in-kind)	$35.0 million (plus $1.0 million accrued interest paid-in-kind)	7.00%		November 2024	$2.50 per share
Mann Group non-    convertible note	$35.1 million (plus $1.6 million accrued interest paid-in-kind)	$35.1 million (plus $1.0 million accrued interest paid-in-kind)	7.00%		November 2024	N/A
MidCap Credit    Facility	$40.0 million	$40.0 million	one-month LIBOR (2% floor) plus 6.75%		August 2024	N/A
2024 convertible notes	$5.0 million	$5.0 million	5.75%		November 2024	$3.00 per share
June 2020 note	$2.6 million	$2.6 million		—	June 2020	N/A
December 2020 note	$2.6 million	$2.6 million		—	December 2020	N/A

Schedule of Maturities of Our Borrowings

The maturities of our borrowings as of March 31, 2020 are as follows (in thousands):

	Amounts
2020	$	5,262
2021		4,444
2022		13,333
2023		13,333
2024		83,940
Thereafter		—
Total principal payments		120,312
Unamortized discount		(450	)
Debt issuance costs		(846	)
Total debt — net carrying amount	$	119,016

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 three months ended March 31, 2020 and 2019 are as follows (in thousands):

	Three Months Ended March 31,
	2020			2019
Amortization of debt discount	$	89		$	72
Accretion expense — debt issuance cost		(27	)		(22	)
Amortization of debt premium		—			(95	)