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Debt (Tables)

12 Months Ended

Dec. 31, 2021

Debt

Schedule of carrying value of Convertible Senior Notes


			December 31, 2021									December 31, 2020
			Principal Amount			Unamortized debt discount/ transaction costs			Net carrying value			Principal Amount			Unamortized debt discount/ transaction costs			Net carrying value

			(in thousands)
2023 Notes		$	20,173		$	(967)		$	19,206		$	131,695		$	(11,925)		$	119,770
2025 Notes			132,500			(17,302)			115,198			132,500			(22,097)			110,403
2027 Notes			125,000			(29,966)			95,034			125,000			(34,058)			90,942
Net carrying value		$	277,673		$	(48,235)		$	229,438		$	389,195		$	(68,080)		$	321,115

Schedule of interest expense related to Convertible Senior Notes


			For the year ended December 31,
			2021			2020			2019

			(in thousands)
Cash Interest Expense
Coupon interest expense - 2023 Notes			$	3,138		$	7,390		$	9,315
Coupon interest expense - 2025 Notes				4,637			554			—
Coupon interest expense - 2027 Notes				4,688			2,904			—
Non-cash Interest Expense
Amortization of debt discount/transaction costs- 2023 Notes				4,932			10,887			12,676
Amortization of debt discount/transaction costs- 2025 Notes				4,795			546			—
Amortization of debt discount/transaction costs- 2027 Notes				4,092			2,359			—
Total Interest Expense			$	26,282		$	24,640		$	21,991