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Related-Party Arrangements (Tables)

3 Months Ended

Mar. 31, 2019

	March 31, 2019			December 31, 2018
Principal amount	$	71,506		$	71,506
Unamortized premium		581			639
Unaccreted debt issuance costs		(51	)		(56	)
Net carrying amount	$	72,036		$	72,089

Schedule of Interest Expense on Note Payable to Related Party

Interest expense (excluding the amortization of debt premium and debt issuance costs) for the three months ended March 31, 2019 and 2018 was as follows (in thousands):

	Three Months Ended March 31,
	2019		2018
Interest expense on note payable to related party	$	1,075	$	1,122

Schedule of Amortization of Premium and Accretion of Debt Issuance Costs

Amortization of the premium and accretion of debt issuance costs related to the 2021 notes for the three months ended March 31, 2019 and 2018 are as follows:

	Three Months Ended March 31,
	2019		2018
Amortization of debt premium	$	36	$	43
Accretion expense - debt issuance cost		2	$	—

Related Party Notes

Schedule of Amortization of Premium and Accretion of Debt Issuance Costs

Amortization of the premium and accretion of debt issuance costs related to the related party notes for the three months ended March 31, 2019 and 2018 are as follows (in thousands):

	Three Months Ended March 31,
	2019		2018
Amortization of debt premium	$	59	$	10
Accretion expense - debt issuance cost	$	6	$	2