Convertible Notes (Tables)

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Schedule of carrying value and unamortized discount on December 2021 Notes [Table Text Block]

The carrying value and unamortized discount of the December 2021 Notes were as follows:

(in thousands)	March 31, 2020			December 31, 2019
Principal amount of the December 2021 Notes	$	13,805		$	19,170
Unamortized discount of liability component	(1,403		)	(2,220		)
Net carrying value of the December 2021 Notes	$	12,402		$	16,950

Schedule of convertible and non-recourse notes activity

		Principal Balance Outstanding		Carrying Value
		March 31,		March 31,		December 31,
Description	Maturity Date	2020		2020		2019
(in thousands)
Convertible Senior Notes
December 2021 Notes	December 1, 2021	$	13,805	$	12,402	$	16,950
December 2024 Notes	December 1, 2024	1,000		900		10,300
Total		$	14,805	$	13,302	$	27,250

Schedule of carrying value and unamortized discount on February 2018 Notes [Table Text Block]

Schedule of interest expense for February 2018 Notes [Table Text Block]

Schedule of interest expense for December 2021 Notes [Table Text Block]

Interest expense for the December 2021 Notes included in the Company’s Condensed Consolidated Statements of Operations was as follows:

	Three Months Ended
	March 31,
(in thousands)	2020		2019
Contractual coupon interest	$	123	$	1,031
Amortization of debt issuance costs	2		20
Amortization of debt discount	17		138
Amortization of conversion feature	234		1,766
Total	$	376	$	2,955