Convertible Subordinated Notes

3 Months Ended

Mar. 31, 2021

Convertible Subordinated Notes [Abstract]

CONVERTIBLE SUBORDINATED NOTES

During the three months ended March 31, 2021, we converted approximately $2.4 million in aggregate principal amount of our 2.75% convertible subordinated notes due 2021 (the “Convertible Notes”) held by certain holders for approximately $3.8 million in cash and recorded $1.4 million for the reacquisition of the equity component. The Convertible Notes matured on March 15, 2021, at which time all Convertible Notes outstanding, approximately $0.2 million in aggregate principal amount, were paid in full in cash at par value. Therefore, no Convertible Notes remain outstanding at March 31, 2021.

The carrying values of the liability and equity components of our Convertible Notes are reflected on our Consolidated Balance Sheet as follows (in thousands):


	December 31, 2020		March 31, 2021
Current liabilities:
Principal amount	$	2,559	$	—
Unamortized discount of liability component	(20)		—
Convertible Notes issuance costs, net of accumulated amortization of $63 and $64, respectively	(1)		—
Carrying value of the liability component	$	2,538	$	—

Carrying value of the equity component	$	319	$	—

The carrying value of the liability component and the carrying value of the equity component are recorded in Convertible subordinated notes due 2021 and Additional paid-in capital, respectively, on our Consolidated Balance Sheet at December 31, 2020.

The interest expense and accretion of debt discount and debt issuance costs related to our Convertible Notes are as follows (in thousands):


	Three months ended March 31,
	2020		2021
Convertible Notes interest expense	$	43	$	18
Convertible Notes accretion of debt discount	65		20
Convertible Notes amortization of debt issuance costs	6		1

The effective interest rate on the unamortized debt discount for both the three months ended March 31, 2020 and 2021 was 11.4%. The effective interest rate on the debt issuance costs for the three months ended March 31, 2020 and 2021 was 3.2% and 3.1%