Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Allocated Stock Based Compensation Expense

Stock-based compensation expense was allocated based on the employees’ and non-employees’ functions as follows:

	Three Months Ended March 31,
	2021		2020
Cost of goods sold	$	176	$	71
Research and development		341		201
Sales and marketing		921		440
General and administrative		1,247		735
Total	$	2,685	$	1,447

Schedule of Weighted Average Assumptions Used in Black-Scholes Options Pricing Model

The weighted average assumptions used in the Black-Scholes options pricing model are as follows:

	Three Months Ended March 31,
	2021			2020
Expected dividend yield		0.0	%		0.0	%
Risk free interest rate		0.5	%		1.8	%
Expected stock price volatility		88.3	%		87.6	%
Expected term (years)		6.1			6.1

Restricted Stock Units

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Restricted Stock Units and Restricted Stock Awards

A summary of restricted stock unit activity for the three months ended March 31, 2021 is as follows:

				Weighted
				Average
				Grant Date
	Shares			Fair Value
Unvested at December 31, 2020		228,489		$	25.60
Granted		169,096			27.53
Vested		(1,921	)		22.35
Canceled		(2,050	)		12.74
Unvested at March 31, 2021		393,614		$	26.52

Restricted Stock Awards

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Restricted Stock Units and Restricted Stock Awards

A summary of restricted stock award activity for the three months ended March 31, 2021 is as follows:

				Weighted
				Average
				Grant Date
	Shares			Fair Value
Unvested at December 31, 2020		103,650		$	1.68
Granted/purchased		-			-
Vested		(27,778	)		1.68
Canceled		-			-
Unvested at March 31, 2021		75,872		$	1.68