Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt

Schedule of long term debt

Long‑term debt consisted of the following (in thousands):

	December 31,
		2019	2018
Principal amount of long‑term debt	$	50,000	$	25,000
Less: Current portion of long‑term debt		—		—
Long‑term debt, net of current portion		50,000		25,000
Accrued final interest payment		213		16
Debt discount		(617)		(669)
Long‑term debt, net of discount and current portion	$	49,596	$	24,347

Schedule of estimated future principal payments due

As of December 31, 2019, the estimated future principal payments due were as follows (in thousands):

Year ending December 31,
2020	$	—
2021		—
2022		25,000
2023		25,000
2024 and thereafter		—
	$	50,000