Fair Value Measurements (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2020

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Liabilities measured at fair value by level

The following table summarizes the Company’s liabilities measured at fair value as of September 30, 2020 and December 31, 2019, by level within the fair value hierarchy (in thousands):

	Level 1		Level 2		Level 3
September 30, 2020
Promissory note	$	—	$	—	$	16,327
December 31, 2019
Promissory note	$	—	$	—	$	16,169

The following table summarizes the Company’s liabilities measured at fair value as of December 31, 2019 and 2018, by level within the fair value hierarchy (in thousands):

	Level 1		Level 2		Level 3
December 31, 2019
Promissory note	$	—	$	—	$	16,169
December 31, 2018
Promissory note	$	—	$	—	$	15,852

Changes in fair value of promissory notes

The following table includes the changes in fair value of the promissory note which are Level 3 on the fair value hierarchy (in thousands):

	2020
Fair value at January 1,	$	16,169
Interest expense accrued	112
Increase in fair value	46
Fair value at September 30,	$	16,327
	2019
Fair value at January 1,	$	15,852
Interest expense accrued	150
Increase in fair value	167
Fair value at December 31,	$	16,169

The following table includes the changes in fair value of the promissory notes which are Level 3 on the fair value hierarchy (in thousands):

	2019		2018
Fair value at January 1,	$	15,852	$	27,756
Interest expense accrued	150		364
Principal and interest expense paid	—		(13,328)
Increase in fair value	167		1,060
Fair value at December 31,	$	16,169	$	15,852