Common Stock and Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Summary of Activity under Stock Option Plan

Activity under the Company’s stock option plan is set forth below:

						Weighted-
				Weighted		Average
				Average		Remaining		Aggregate
				Exercise		Contractual		Intrinsic Value
	Number of Shares			Price		Term (Years)		(in thousands)
Balance—December 31, 2018		2,297,403		$	4.49		6.9	$	9,858
Granted		—		$	—
Exercised		(453,293	)	$	3.81
Canceled		(33,206	)	$	6.30
Balance—June 30, 2019		1,810,904		$	4.63		6.5	$	15,206
Vested and exercisable—June 30, 2019		1,311,186		$	4.00		6.2	$	11,844
Vested and exercisable—December 31, 2018		1,547,754		$	3.74		6.5	$	7,803

Summary of Activity under Company's RSU

Activity under the Company’s RSU is set forth below:

				Weighted
				Average
				Market
	Number of Shares			Value
Balance—December 31, 2018		1,554,089		$	12.73
Granted		2,070,526		$	9.30
Released		(388,437	)	$	12.66
Canceled		(101,261	)	$	11.04
Balance—June 30, 2019		3,134,917		$	10.42

Schedule of Stock-Based Compensation Expense

Stock-based compensation expense recognized in the consolidated statements of operations and comprehensive loss for options, restricted stock units and ESPP was as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Cost of revenue	$	86	$	21	$	152	$	46
Research and development		1,821	521			3,053		1,094
Sales and marketing	398		162		748		273
General and administrative	584		458			1,226	727
Total	$	2,889	$	1,162		5,179	$	2,140

AQUANTIA CORP 10-Q