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Stock-Based Incentive Compensation Plans (Tables)
6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Option Activity Under Stock Option Plan
The table below summarizes the stock option activity for the six months ended June 30, 2019:
 
 
Number of
Shares
 
Weighted-
Average
Exercise
Price
Outstanding as of December 31, 2018
 
2,641,198

 
$4.27
Options granted
 
630,639

 
20.91
Options exercised
 
(184,130
)
 
3.10
Options canceled
 
(62,964
)
 
6.61
Outstanding as of June 30, 2019
 
3,024,743

 
7.76
Schedule of Valuation Assumptions Related to Stock Option Awards
The Company estimated the fair value of ESPP purchase rights during the offer period using a Black-Scholes option pricing model with the following assumptions:
 
 
Three and Six Months Ended
 
 
June 30, 2019
Expected term
 
0.5 years
Expected volatility
 
58.35%
Risk-free interest rate
 
2.49%
Dividend yield
 
—%
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
 
Six Months Ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
Weighted average grant date fair value per share
$8.00
 
$2.11
 
$9.79
 
$2.09
Expected term
5.0 to 7.0 years
 
5.0 to 7.0 years
 
5.0 to 7.0 years
 
5.0 to 7.0 years
Expected volatility
46.6% to 47.2%
 
42.0% to 44.4%
 
41.7% to 47.2%
 
42.0% to 45.1%
Risk-free interest rate
1.83% to 2.41%
 
2.83% to 2.93%
 
1.83% to 2.59%
 
2.35% to 2.93%
Dividend yield
—%
 
—%
 
—%
 
—%
Schedule of Restricted Stock Unit Activity
The table below summarizes restricted stock units activity for the six months ended June 30, 2019:
 
 
Number of Shares
 
Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2018
 
53,436

 
$11.69
Granted
 
548,906

 
20.49
Forfeited
 
(10,384)

 
19.84
Vested
 
(27,320
)
 
20.97
Outstanding as of June 30, 2019
 
564,638

 
19.65
Schedule of Stock-Based Compensation
The table below presents the detail of stock-based compensation expense amounts included in the consolidated statements of operations (in thousands):
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2019
 
2018
 
2019
 
2018
Cost of goods sold
 
$
63

 
$
6

 
$
106

 
$
12

Sales and marketing
 
940

 
113

 
1,674

 
240

Research and development
 
124

 
31

 
220

 
70

General and administrative
 
687

 
213

 
1,685

 
432

 
 
$
1,814

 
$
363

 
$
3,685

 
$
754