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Stock Option Plan (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Activity Under Stock Option Plan

The following table summarizes activity under the Plan for the nine months ended September 30, 2018:

		Options Outstanding
		Shares Available for Grant			Number of Shares			Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Life		Aggregate Intrinsic Value
												(in years)		(in thousands)
Balances at December 31, 2017		29,654			3,001,929			$	4.15					$	3,585
Options granted		(73,783	)		73,783			5.51
Options exercised		—			(309,767	)		4.11						960
Options cancelled		54,278			(54,278	)		4.77
Balances at September 30, 2018		10,149			2,711,667			$	4.12			6.8		$	23,957
Options vested and exercisable - September 30, 2018					1,639,606			$	3.65			6.0		$	15,271
Options vested and expected to vest - September 30, 2018					2,489,664			$	4.01			6.7		$	22,285

Schedule of Stock-Based Compensation

The following table sets forth stock-based compensation expense related to options granted for the periods presented (in thousands):

		Three Months Ended September 30,								Nine Months Ended September 30,
		2018				2017				2018				2017
Cost of goods sold		$	5			$	5			$	17			$	18
Research and development		30				33				101				98
Sales and marketing		110				107				350				313
General and administrative		183				198				613				609
		$	328			$	343			$	1,081			$	1,038

Schedule of Valuation Assumptions Related to Stock Option Awards

The grant date fair value of the stock option awards granted to employees was estimated at the date of grant using a Black-Scholes option-pricing model with the following assumptions:

	Three months ended				Nine months ended
	September 30,				September 30,
	2018		2017		2018		2017
Expected term	6.04		6.03		5.98		5.05
Expected volatility	41%-44%		42%-46%		41%-46%		41%-55%
Risk-free interest rate	2.74%-2.80%		1.73%-2.15%		2.35%-2.93%		1.73%-2.75%
Dividend yield	—%		—%		—%		—%

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Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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-Publisher FASB
-Name Accounting Standards Codification
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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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