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Debt (Tables)

12 Months Ended

Dec. 31, 2022

Debt

Schedule of carrying value of Convertible Senior Notes


			December 31, 2022									December 31, 2021
			Principal Amount			Unamortized transaction costs			Net carrying value			Principal Amount			Unamortized debt discount/ transaction costs			Net carrying value

			(in thousands)
2023 Notes		$	20,173		$	(4)		$	20,169		$	20,173		$	(967)		$	19,206
2025 Notes			132,500			(990)			131,510			132,500			(17,302)			115,198
2027 Notes			125,000			(2,019)			122,981			125,000			(29,966)			95,034
Net carrying value		$	277,673		$	(3,013)		$	274,660		$	277,673		$	(48,235)		$	229,438

Schedule of interest expense related to Convertible Senior Notes


		For the year ended December 31,
		2022			2021			2020

		(in thousands)
Cash Interest Expense
Coupon interest expense - 2023 Notes		$	545		$	3,138		$	7,390
Coupon interest expense - 2025 Notes			4,637			4,637			554
Coupon interest expense - 2027 Notes			4,688			4,688			2,904
Non-cash Interest Expense
Amortization of debt discount/transaction costs- 2023 Notes			97			4,932			10,887
Amortization of debt discount/transaction costs- 2025 Notes			457			4,795			546
Amortization of debt discount/transaction costs- 2027 Notes			408			4,092			2,359
Total Interest Expense		$	10,832		$	26,282		$	24,640