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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based compensation expense

Stock-based compensation expense included in the consolidated statements of operations and comprehensive loss was as follows:

	Three Months Ended September 30,								Nine Months Ended September 30,
(in thousands)	2018				2017				2018				2017
Cost of revenue	$	692			$	63			$	883			$	167
Sales and marketing	2,707				409				3,984				1,037
Research and development	2,427				510				3,594				1,356
General and administrative	2,957				1,046				5,745				2,943
Total stock-based compensation expense	$	8,783			$	2,028			$	14,206			$	5,503

Stock option activity

A summary of our stock option activity is presented below:

(in thousands, except for per share data and years)	Number of Shares		Weighted Average Exercise Price				Weighted-Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding at December 31, 2017	14,573		$	4.38			8.2		$	77,020
Granted	6,108		15.17
Exercised	(654)		2.16
Forfeited/canceled	(640)		6.81
Outstanding at September 30, 2018	19,387		7.77				8.2		603,127
Exercisable at September 30, 2018	5,855		3.55				6.7		206,850

Stock option valuation assumptions

The fair value of each stock option was estimated on the grant date based on the following assumptions:

	Nine Months Ended September 30, 2018
Expected term (in years)	6.3
Expected volatility	41.3% — 43.3%
Risk-free interest rate	2.7% — 2.9%
Expected dividend yield	—

Summary of restricted stock and restricted stock units

A summary of our restricted stock and restricted stock units activity is presented below:

	Restricted Stock							Restricted Stock Units
(in thousands, except for per share data and years)	Number of Shares			Weighted Average Grant Date Fair Value				Number of Shares			Weighted Average Grant Date Fair Value
Unvested balance at December 31, 2017	1,583			$	4.25			—			$	—
Granted	—			—				1,097			17.82
Vested	(594)			4.25				—			—
Forfeited	—			—				(47)			16.22
Unvested balance at September 30, 2018	989			4.25				1,050			17.89

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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