Fair Value of Financial Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Schedule of financial assets and liabilities measured at fair value on a recurring basis

The following tables present information about the Company's financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2020 and December 31, 2019, and indicate the level of the fair value hierarchy utilized to determine such fair value:

		Fair Value Measurement as of September 30, 2020 Using:
Balance Sheet Classification	Type of Instrument	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	Money market funds	$	167,343	$	—	$	—	$	167,343
Cash equivalents	U.S. corporate bonds	—		2,639		—		2,639
Marketable securities	U.S. treasury bills	—		79,954		—		79,954
Marketable securities	U.S. corporate bonds	—		133,959		—		133,959
Marketable securities	Foreign corporate bonds	—		16,070		—		16,070
Total assets		$	167,343	$	232,622	$	—	$	399,965
Liabilities:
Series B preferred shares forward contracts		—		—		1,940		1,940
Total liabilities		$	—	$	—	$	1,940	$	1,940

	Fair Value Measurement as of December 31, 2019 Using:
	Level 1		Level 2		Level 3		Total
Liabilities:
Series A preferred shares derivative liability	$	—	$	—	$	37,690	$	37,690
Total liabilities	$	—	$	—	$	37,690	$	37,690

Schedule of aggregate fair value of derivative liability determined by Level 3 inputs

The following table provides a roll forward of the aggregate fair value of the Company’s Series A preferred shares derivative liability (see Note 10) for which fair value is determined by Level 3 inputs for the nine months ended September 30, 2020 and 2019:

	Series A Derivative Liability
Balance at December 31, 2019	$	37,690
Change in fair value	5,131
Settlement of Series A preferred shares derivative liability	(42,821)
Balance at September 30, 2020	$	—
Transaction date balance	$	33,815
Change in fair value	2,980
Balance at September 30, 2019	$	36,795

The following table provides a roll forward of the aggregate fair value of the Company's Series B Preferred Shares Forward Contracts for which fair value is determined by Level 3 inputs for the nine months ended September 30, 2020:

	Forward Contracts
Transaction date balance	$	—
Change in fair value	1,940
Balance at September 30, 2020	$	1,940