Stock-Based Incentive Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock Option Activity Under Stock Option Plan

The table below summarizes the stock option activity for the three months ended March 31, 2020:

	Number of Shares	Weighted- Average Exercise Price
Outstanding as of December 31, 2019	2,718,971	$8.02
Granted	26,236	17.31
Exercised	(43,334)	4.03
Canceled and forfeited	(1,319)	12.87
Outstanding as of March 31, 2020	2,700,554	8.17

Schedule of Valuation Assumptions Related to Stock Option Awards

The table below summarizes the weighted average grant date fair value per share and the assumptions used to estimate the grant date fair value of the stock options granted during the respective periods using the Black-Scholes option-pricing model:

	Three Months Ended March 31,
	2020			2019
Weighted average grant date fair value per share	$8.37			$10.40
Expected term (years)	5.5	to	7.0	5.0	to	7.0
Expected volatility	46.74%	to	47.20%	42.00%	to	47.00%
Risk-free interest rate	1.56%	to	1.64%	2.52%	to	2.59%
Dividend yield	—%			—%

Schedule of Restricted Stock Unit Activity

The table below summarizes restricted stock units activity for the three months ended March 31, 2020:

	Number of Shares	Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2019	543,041	$19.72
Granted	868,683	20.43
Vested	(63,938)	21.00
Canceled and forfeited	(5,575)	18.43
Outstanding as of March 31, 2020	1,342,211	20.13

Schedule of Stock-Based Compensation

The table below presents the detail of stock-based compensation expense amounts included in the condensed consolidated statements of operations:

	Three Months Ended March 31,
	2020		2019
	(in thousands)
Cost of goods sold	$	71	$	42
Sales and marketing	1,141		670
Research and development	240		96
General and administrative	1,170		1,063
	$	2,622	$	1,871