Stock-Based Compensation

9 Months Ended

Sep. 30, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

Note 4. Stock-Based Compensation

The following table summarizes option award activity under our equity incentive plans for the nine months ended September 30, 2016 (in thousands, except per share data):

	Number of SharesUnderlying Options			Weighted-Average Exercise Price Per Share		Weighted-Average Remaining Contractual Life (Years)		Total Intrinsic Value
Outstanding at December 31, 2015		1,896		$	3.72	$	7.77	$	8,666
Granted		582			19.62
Exercised		(168	)		3.30
Forfeited or Cancelled		(73	)		5.64
Outstanding at September 30, 2016		2,237			7.84		7.79		66,175
Vested and exercisable at September 30, 2016		1,022		$	2.48	$	6.24	$	35,704

 The following table summarizes unvested shares of common stock activity for the nine months ended September 30, 2016 (in thousands, except per share data):

	Number of SharesUnderlying Options			Weighted-Average Exercise Price Per Share
Outstanding at December 31, 2015		136		$	1.76
Issued		58			5.33
Vested		(54	)		1.70
Outstanding at September 30, 2016		140			3.26

As of September 30, 2016, there was a total of $7.0 million in unrecognized compensation cost related to unvested stock options.

The following table presents the effects of stock-based compensation in our condensed consolidated statements of operations during the periods presented (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
Cost of revenue	$	28	$	5	$	39	$	26
Research and development expense		282		57		416		241
Sales and marketing expense		343		190		754		507
General and administrative expense		102		33		208		111
Total stock-based compensation expense		755		285		1,417		885