Stockholders’ Equity (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Authorized, Issued, and Outstanding Shares of Convertible Preferred Stock

The authorized, issued, and outstanding shares of convertible preferred stock as of March 31, 2018 and December 31, 2017 are as follows:

(in thousands)	Shares Authorized	Shares Issued and Outstanding	Aggregate Liquidation Preference
Series C	22,862	4,572	$	38,820
Series D	28,301	5,660	25,980
Series E	11,839	2,348	17,537
Series F	37,253	7,256	37,334
Series G	29,223	4,805	28,783
	129,478	24,641	$	148,454

Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity during the three months ended March 31, 2018:

(in thousands)	Number of shares		Weighted average exercise price	Weighted average remaining contractual term (years)	Aggregate intrinsic value
Outstanding, December 31, 2017	5,369		$1.09	7.4	$29,863
Options granted	347		$9.70
Options exercised	(76	)	$0.81
Options canceled	(10	)	$1.66
Outstanding, March 31, 2018	5,630		$1.62	7.4	$47,168
Options exercisable at March 31, 2018	2,439		$0.85	6.8	$22,469
Options vested as of March 31, 2018 and expected to vest after March 31, 2018	4,518		$1.63	8.0	$43,536

Total Compensation Cost Related to Nonvested Awards Not Yet Recognized

Total compensation cost related to nonvested awards not yet recognized is $2.8 million, which will be recognized during the remainder of 2018 and subsequent years as follows:

(in thousands)
2018	$	581
2019	707
2020	614
2021	551
2022	370
2023	6
	$	2,829