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Convertible debt (Tables)

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

The following is a summary of the Company's convertible senior notes as of June 30, 2020 (in thousands):

			Date of Issuance						Unpaid Principal Balance						Net Carrying Amount																		Contractual Interest Rates
																					Current						Noncurrent
1% Convertible Notes due in 2024 ("2024 Notes")			May 2019						$	143,750					$	—					$	114,131					1%

Convertible Debt [Table Text Block]

The 2024 Notes consist of the following (in thousands):

			June 30, 2020						December 31, 2019
Liability component:
Principal			$	143,750					$	143,750
Less: debt discount and issuance cost, net of amortization			(29,619)						(33,046)
Net carrying amount			$	114,131					$	110,704
Equity component(1)			$	32,883					$	32,883

(1)  Recorded within additional paid-in capital in the unaudited condensed consolidated balance sheet. As of June 30, 2020 and December 31, 2019, it included $32.9 million related to the 2024 Notes, which was net of $1.1 million issuance cost in equity.

The following table sets forth total interest expense recognized related to the Notes (in thousands):

			Three Months Ended June 30,																		Six Months Ended June 30,
			2020						2019						2020						2019
Coupon interest			$	359					$	1,106					$	719					$	2,356
Amortization of debt issuance costs			158						341						314						706
Amortization of debt discount			1,568						2,827						3,114						5,568
Total			$	2,085					$	4,274					$	4,147					$	8,630

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- Definition

Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components.

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- Definition

Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.

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