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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance related to outstanding equity awards, common stock warrants, and employee equity incentive plans were as follows (in thousands):



		June 30, 2018
Stock options outstanding		3,333
Restricted stock units outstanding		2,705
Shares available for future grant under 2014 Plan		8,666
Shares available for future issuance under ESPP		1,801
Common stock warrants outstanding		13
Total shares of common stock reserved		16,518

Schedule of Stock Option Activity

A summary of the Company’s stock option activity during the six months ended June 30, 2018 is as follows (in thousands, except years and per share data):



	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding as of December 31, 2017	4,047		$	8.00
Options granted (weighted average grant date fair value of $14.14 per share)	268		30.37
Options exercised	(974	)	5.93
Options forfeited or expired	(8	)	4.68
Outstanding as of June 30, 2018	3,333		$	10.41	6.4	$	80,524

Schedule of RSU Activity

A summary of the Company’s restricted stock unit (“RSU”) activity during the six months ended June 30, 2018 is as follows (in thousands, except per share data):



	Number of Shares		Weighted Average Grant Date Fair Value Per Share
Outstanding as of December 31, 2017	2,033		$	12.81
RSUs granted	1,285		30.51
RSUs vested and released	(534	)	12.25
RSUs forfeited	(79	)	17.64
Outstanding as of June 30, 2018	2,705		$	21.18

Schedule of Stock-based Compensation Expense

Stock-based compensation expenses were as follows (in thousands):



	Three Months Ended				Six Months Ended
	June 30, 2018		June 30, 2017		June 30, 2018		June 30, 2017
Cost of revenue	$	853	$	575	$	1,531	$	1,009
Research and development	1,064		801		1,941		1,438
Sales and marketing	1,585		1,224		2,947		2,152
General and administrative	3,295		1,254		5,703		2,384
Total stock-based compensation	$	6,797	$	3,854	$	12,122	$	6,983

Schedule of Unrecognized Compensation Expense

As of June 30, 2018, unrecognized stock-based compensation expenses by award type and their expected weighted-average recognition periods are summarized in the following table (in thousands, except years).



	Stock Option		RSU		ESPP
Unrecognized stock-based compensation expense	$	11,366	$	56,023	$	708
Weighted-average amortization period	2.6 years		3.0 years		0.4 years

Schedule of Valuation Assumptions, Stock Option

The weighted-average assumptions used to value stock options granted during the periods presented were as follows:



Stock Options	Three Months Ended				Six Months Ended
	June 30, 2018		June 30, 2017		June 30, 2018	June 30, 2017
Expected term (years)	6.1		6.1		6.0	6.2
Volatility	44	%	49	%	45%	49%
Risk-free interest rate	2.7	%	2.0	%	2.7%	2.0%
Dividend yield ⁽¹⁾	—		—		—	—


(1)	The Company has not paid, and does not anticipate paying, cash dividends on its shares of common stock. Accordingly, the expected dividend yield is zero.