Convertible Preferred Stock (Tables)

9 Months Ended

Sep. 30, 2018

Class of Stock [Line Items]

Schedule of Stock by Class

Common stock has been reserved for the following potential future issuances:

	September 30, 2018	December 31, 2017
	(unaudited)
Conversion of outstanding convertible preferred stock	58,264,577	58,264,577
Shares underlying outstanding stock options	7,717,070	7,391,052
Shares available for future stock option grants	509,584	1,698,790
Exercise and conversion of preferred stock warrants	7,636	7,636
Exercise of common stock warrants	40,538	313,741
Total	66,539,405	67,675,796

Convertible Preferred Stock

Class of Stock [Line Items]

Schedule of Stock by Class

The Company’s convertible preferred stock consisted of the following:

	September 30, 2018
	Shares Authorized	Shares Issued and Outstanding	Aggregate Liquidation Preference		Net Carrying Value
	(unaudited)
			(in thousands)
Series A	9,935,864	9,263,558	$	8,598	$	8,531
Series B	10,320,952	10,297,182	32,490		32,428
Series C	8,873,996	8,873,996	55,999		55,921
Series D	11,222,041	11,222,041	83,904		83,559
Series E	39,751,611	38,970,592	320,419		319,535
Total convertible preferred stock	80,104,464	78,627,369	$	501,410	$	499,974

	December 31, 2017
	Shares Authorized	Shares Issued and Outstanding	Aggregate Liquidation Preference		Net Carrying Value
			(in thousands)
Series A	9,935,864	9,263,558	$	8,598	$	8,531
Series B	10,320,952	10,297,182	32,490		32,428
Series C	8,873,996	8,873,996	55,999		55,921
Series D	11,222,041	11,222,041	83,904		83,559
Series E	39,751,611	38,970,592	320,419		319,535
Total convertible preferred stock	80,104,464	78,627,369	$	501,410	$	499,974