v3.19.3.a.u2

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of stock option activity

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Outstanding Options

​

​

​

​

Weighted-

​

​

​

​

​

​

​

Weighted-

​

Average

​

​

​

​

Shares

​

​

​

Average

​

Remaining

​

Aggregate

​

​

Available for

​

Number of

​

Exercise

​

Contractual

​

Intrinsic

(in thousands, except for contractual life and exercise price)

​

Grant

​

Shares

​

Price

​

Life

​

Value

​

​

​

​

​

​

​

​

​

(In years)

​

​

Balance at December 31, 2018

5,431

9,463

​

$

7.69

6.91

​

$

61,718

​

Additional shares authorized

2,483

​

—

​

$

—

​

​

​

​

​

​

Options granted

(1,838)

1,838

​

$

18.01

​

​

​

​

​

​

Options exercised

—

(2,464)

​

$

5.29

​

​

​

​

​

​

Options forfeited

340

(340)

​

$

13.13

​

​

​

​

​

​

Balance at December 31, 2019

6,416

8,497

​

$

10.39

6.88

​

$

197,955

​

Exercisable at December 31, 2019

​

​

4,835

​

$

7.27

5.56

​

$

127,753

​

Vested and expected to vest at December 31, 2019

​

​

8,288

​

$

10.29

6.83

​

$

193,940

​

Summary of offering activity

​

​	​	​	​	​	​
​	​	Number of	​	Total
​	​	Shares Purchased	​	Proceeds
Offering Period	​	​	​	​	(in thousands)
November 1, 2017 - April 30, 2018	​	206,447	​	$	1,855
May 1, 2018 - October 31, 2018	​	184,825	​	$	1,763
November 1, 2018 - April 30, 2019	​	132,177	​	$	2,147
May 1, 2019 - October 31, 2019	​	136,084	​	$	2,176

Restricted stock units

​

​	​	​	​	​	​
​	​	​	​	Weighted-
​	​	​	​	Average
​	​	Number of	​	Grant Date
​	​	Shares	​	Fair Value
​	​	​	​	​	​
Balance at December 31, 2018	​	1,084	​	$	11.72
Granted	​	2,019	​	$	20.97
Vested	​	(541)	​	$	12.56
Canceled/Forfeited	​	(158)	​	$	16.68
Balance at December 31, 2019		2,404	​	$	19.86
​	​	​	​	​	​

Summary of stock-based compensation expenses

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Year ended December 31,

​

​

2019

​

2018

​

2017

​

Employee

Non-Employee

Total

Employee

Non-Employee

Total

Employee

Non-Employee

Total

​

(in thousands)

​

Cost of revenues

​

$

905

​

$

32

​

`

937

​

$

564

​

$

5

​

$

569

​

$

544

​

$

—

​

$

544

​

Research and development

​

5,354

​

—

​

5,354

​

4,043

​

—

​

4,043

​

​

3,214

​

—

​

​

3,214

​

Selling, general and administrative

​

21,730

​

603

​

22,333

​

9,474

​

112

​

9,586

​

​

7,644

​

—

​

​

7,644

​

Total

​

$

27,989

​

$

635

​

$

28,624

​

$

14,081

​

$

117

​

$

14,198

​

$

11,402

​

$

—

​

$

11,402

​

Performance-based awards

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of assumptions used in valuation of fair value of employee stock options

​

​	​	​
​	December 31,
​	2019
Risk-free interest rate	​	1.63% – 2.61%
Expected dividend yield	​	—
Expected volatility	​	50.00%
Expected term (years)	​	7.25

Employee stock options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of assumptions used in valuation of fair value of employee stock options

​

​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	Year ended December 31,
​		2019						2018						2017				​
Expected term (years)		5.23	​	—	10.00	​	​	5.24	​	—	5.62	​	​	5.14	​	—	5.24	​
Expected volatility		42.53	%	—	45.84	%		40.28	%	—	42.53	%	​	40.75	%	—	62.93	%
Expected dividend rate		​	​	​	0	%		​	​	​	0	%	​	​	​	​	0	%
Risk-free interest rate		1.60	%	—	2.60	%		2.37	%	—	3.06	%	​	1.67	%	—	2.16	%

Non-employee stock options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of assumptions used in valuation of fair value of employee stock options

​

​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	Year ended December 31,
​		2018						2017
Expected term (years)		2.72	​	—	2.76	​	​	2.67	​	—	2.71	​
Expected volatility		41.36	%	—	43.84	%	​	41.22	%	—	52.18	%
Expected dividend rate		​	​	​	0	%	​	​	​	​	0	%
Risk-free interest rate		2.36	%	—	2.86	%	​	1.42	%	—	1.95	%

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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