Debt (Tables)

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Convertible Debt [Table Text Block]

Convertible senior notes consist of the following (in thousands):

	September 30, 2020		December 31, 2019
4.875% convertible senior notes due 2020	$	—	$	1,905
3.25% convertible senior notes due 2023*		38,401		50,753
Total convertible senior notes	$	38,401	$	52,658

* The amounts presented for the 3.25% convertible senior notes due 2023 within the table represent the fair value as of September 30, 2020 and December 31, 2019 (see Note 16 - Fair Value Measurements). The principal amount of these notes totaled $29.6 million and $37.6 million as of September 30, 2020 and December 31, 2019, respectively. The accrued, but unpaid, payment-in-kind interest is $1.0 million and $0.4 million as of September 30, 2020 and December 31, 2019, respectively.

Schedule of Debt [Table Text Block]

Term loan consists of the following (in thousands):

	September 30, 2020							December 31, 2019
	Principal Amount**		Debt Discount/ Issuance Costs*			Net Amount		Principal Amount**		Debt Discount/ Issuance Costs*			Net Amount
Term Loan	$	134,801	$	(9,441	)	$	125,360	$	134,801	$	(12,319	)	$	122,482

* The term loan was valued using the discounted cash flow method to determine the implied debt discount. The debt discount and issuance costs are being amortized over the life of the term loan.

** The amount presented excludes accrued, but unpaid, payment-in-kind interest of $4.0 million and $1.3 million as of September 30, 2020 and December 31, 2019, respectively.