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Stock-Based Incentive Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2018

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

Schedule of Stock Option Activity

The following table summarizes stock option activity for the year ended December 31, 2018 for all stock plans:

	Options Outstanding
	Number of Shares			Weighted-Average Exercise Price				Weighted-Average Contractual Remaining Life		Aggregate Intrinsic Value
								(Years)		(in thousands)
Balances at December 31, 2017	3,001,929			$	4.15					$	3,585
Options granted	100,080			$	8.88
Options exercised	(395,117	)		$	4.08
Options canceled	(65,694	)		$	4.81
Balances at December 31, 2018	2,641,198			$	4.27			6.6		$	43,905
Options vested and exercisable - December 31, 2018	1,762,687			$	3.73			5.9		$	41,882
Options vested and expected to vest - December 31, 2018	2,366,723			$	4.14			6.5		$	40,154

Schedule of Stock-Based Compensation

The following table sets forth stock-based compensation expense recognized for the periods presented (in thousands):

			Year ended December 31,
			2018				2017
Cost of goods sold			$	34			$	23
Research and development			156				143
Sales and marketing			651				438
General and administrative			1,471				1,271
			$	2,312			$	1,875

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:

	Year ended
	December 31,
	2018		2017
Expected term	6.17		5.71
Expected volatility	42%-47%		42%-55%
Risk-free interest rate	2.35%-2.96%		1.73%-2.31%
Dividend yield	—%		—%

The assumptions used to determine the grant date fair value of employee stock options and ESPP purchase rights for the periods presented are as follows:

	Year ended
	December 31,
	2018
Expected term	0.5
Expected volatility	43.96%
Risk-free interest rate	2.49%
Dividend yield	—%

Schedule of Restricted Stock Unit Activity

The following table summarizes restricted stock units activity for the year ended December 31, 2018:

		Number of Shares			Weighted- Average Grant Date Fair Value
Unvested as of December 31, 2017		—			$	—
Granted		54,036			$	11.79
Forfeited		(600	)		20.60
Vested		—			$	—
Unvested as of December 31, 2018		53,436			$	11.69

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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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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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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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