Fair Value of Financial Assets and Liabilities - (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value of Financial Assets and Liabilities

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

The following tables summarize the assets and liabilities measured at fair value on a recurring basis at September 30, 2018 and December 31, 2017 (in thousands):

	Fair Value Measurements at September 30, 2018
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds, included in cash and cash equivalents	$	103,137	$	103,137	$		$
Total assets	$	103,137	$	103,137	$	—	$	—

	Fair Value Measurements at December 31, 2017
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds, included in cash and cash equivalents	$	55,291	$	55,291	$	—	$	—
Marketable securities:
U.S. Treasury obligations		1,498		1,498		—		—
Total assets	$	56,789	$	56,789	$	—	$	—
Liabilities:
Warrant to purchase redeemable security	$	37	$	—	$	—	$	37
Total liabilities	$	37	$	—	$	—	$	37

Schedule of changes in the fair value of the warrant, which represented a recurring measurement classified within Level 3 of the fair value hierarchy,

The following table presents activity in the preferred stock warrant during the nine months ended September 30, 2018 (in thousands):

Balance at December 31, 2017	$	(37)
Change in fair value of warrant included in other income (expense), net		(56)
Reclassification to additional paid-in capital upon consummation of the IPO		93
Balance at September 30, 2018	$	—