Annual report pursuant to Section 13 and 15(d)

Equity Incentive Plans (Tables)

Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Fair Value of Stock Option Grants Valuation Assumptions by Block-Scholes Option Pricing Model

The fair value of stock option grants is set forth below and was determined using the Black-Scholes option pricing model with the following assumptions:

	Year Ended December 31,
	2018	2017	2016
Fair value of common stock	$23.72-$47.39	$3.06-$19.56	$0.85-$3.06
Expected term (in years)	6	5-6	2-10
Risk-free interest rate	2.60%-3.00%	1.85%-2.29%	0.75%-1.77%
Expected volatility	64%-67%	55%	55%
Expected dividend yield	—	—	—

Schedule of Stock Option Activity

A summary of stock option activities under the 2005 Plan and 2017 Plan during 2016, 2017 and 2018 is as follows:

	Number of Options Outstanding			Weighted Average Exercise Price
Outstanding at December 31, 2015		938,250		$	0.90
Granted		272,769		$	1.27
Exercised		(33,395	)	$	0.75
Canceled		(47,483	)	$	4.14
Outstanding at December 31, 2016		1,130,141		$	0.86
Granted		261,476		$	5.52
Exercised		(74,984	)	$	0.74
Canceled		(22,505	)	$	1.52
Outstanding at December 31, 2017		1,294,128		$	1.79
Granted		157,078		$	33.70
Exercised		(609,985	)	$	0.90
Canceled		(21,035	)	$	6.78
Outstanding at December 31, 2018		820,186		$	8.44

Schedule of Stock Options Outstanding, Exercisable and Vested

Stock options outstanding, exercisable and vested were as follows:

Outstanding at December 31, 2018		Weighted-average Remaining Contractual Life (years)	Exercisable and Vested as of December 31, 2018		Weighted-average Remaining Contractual Life (years)	Weighted-average Exercise Price
	820,186	7.17		439,927	5.99	1.66

Outstanding at December 31, 2017		Weighted-average Remaining Contractual Life (years)	Exercisable and Vested as of December 31, 2017		Weighted-average Remaining Contractual Life (years)	Weighted-average Exercise Price
	1,294,128	6.22		883,959	5	0.85

Outstanding at December 31, 2016		Weighted-average Remaining Contractual Life (years)	Exercisable and Vested as of December 31, 2016		Weighted-average Remaining Contractual Life (years)	Weighted-average Exercise Price
	1,130,141	6.29		842,261	5.32	0.74

Schedule of Stock-Based Compensation Expense Recorded in Consolidated Statements of Operations

Total stock-based compensation expense associated with the 2005 Plan, 2017 Plan and 2017 ESPP is recorded in the consolidated statements of operations and was allocated as follows (in thousands):

	Year Ended December 31,
	2018		2017		2016
Costs	$	316	$	75	$	11
Sales and marketing		770		133		7
Research and development		272		69		18
General and administrative		1,110		351		47
Total	$	2,468	$	628	$	83