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Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

The fair values of our stock option grants were estimated with the following weighted average assumptions:

The impact on our results of operations from stock-based compensation expense was as follows (in thousands, except per share amounts):

	Three Months Ended March 31,
	2020		2019
Cost of revenue — Edge to Cloud	$	4	$	6
Selling, general and administrative		206		188
Research and development		5		(26	)
Total stock-based compensation expense	$	215	$	168

The following table summarizes stock option activity under the Plans:

						Weighted Average
						Remaining
	Number of			Weighted Average		Contractual Life		Aggregate
	Shares			Exercise Price		(in years)		Intrinsic Value
Balance at December 31, 2019		1,544,826		$	2.74		7.47	$	46,582
Granted		564,900			1.02
Exercised		—			—
Forfeited		(1,500	)		4.02
Expired		(168,448	)		4.79
Balance at March 31, 2020		1,939,778			2.06		8.62		—
Vested and expected to vest at March 31, 2020		1,631,708			2.19		8.46		—
Exercisable at March 31, 2020		467,687		$	3.88		6.14	$	—

The following table summarizes certain information about stock options:

	Three Months Ended March 31,
	2020		2019
Weighted average grant-date fair value of options granted during the period	$	1.02	$	1.97
Options in-the-money (in shares)		—		6,000
Aggregate intrinsic value of options exercised during the period	$	—	$	—

The following table summarizes RSU activity under the Plans:

The following table summarizes our shares of common stock reserved for future issuance under the Plans as of March 31, 2020:

	March 31, 2020
Stock options outstanding		1,939,778
Restricted stock units outstanding		56,421
Stock options and restricted stock units available for future grant		1,335,084
Common stock reserved for future issuance		3,331,283