Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Table Text Blocks

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

	June30,2018
	Level1		Level2		Level3		Total
Assets:
Cash equivalents	$	166,173	$	—	$	—	$	166,173
	$	166,173	$	—	$	—	$	166,173
Liabilities:
SeriesD preferred stock warrant liability		—		—		—		—
Common stock warrant liability		—		—		—		—
	$	—	$	—	$	—	$	—

	December31,2017
	Level1		Level2		Level3		Total
Assets:
Cash equivalents	$	21,597	$	—	$	—	$	21,597
	$	21,597	$	—	$	—	$	21,597
Liabilities:
SeriesD preferred stock warrant liability	$	—	$	—	$	992	$	992
Common stock warrant liability		—		—		1,774		1,774
	$	—	$	—	$	2,766	$	2,766

Schedule of changes in fair values of preferred stock warrant liabilities and common stock warrant liability

	SeriesD
	PreferredStock		CommonStock
	WarrantLiability		WarrantLiability
Fair value at December31,2017		992		1,774
Change in fair value		1,378		7,460
Exercise of common stock warrant		—		(9,234)
Conversion to common stock warrant		(2,370)		—
Fair value at June30,2018	$	—	$	—