STOCK-BASED COMPENSATION (Tables)
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12 Months Ended |
Dec. 31, 2020 |
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| STOCK-BASED COMPENSATION |
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| Schedule of stock-based compensation related to all of the entity's share-based payments |
Total stock-based compensation expense related to all of our stock-based awards was as follows (in thousands):
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Year Ended December 31, |
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2020 |
|
2019 |
|
2018 |
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Selling, general and administrative |
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|
$ |
5,223 |
|
$ |
6,453 |
|
$ |
5,383 |
|
Research and development |
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|
|
2,072 |
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|
2,662 |
|
|
2,321 |
|
Total stock-based compensation expense |
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|
$ |
7,295 |
|
$ |
9,115 |
|
$ |
7,704 |
|
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| Summary of weighted-average assumptions relating to options granted pursuant to equity incentive plans |
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Year Ended |
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December 31, |
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2020 |
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2019 |
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2018 |
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Risk-free interest rate |
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|
1.2 |
% |
2.4 |
% |
2.7 |
% |
Expected term (in years) |
|
|
6.5 |
|
6.5 |
|
6.7 |
|
Dividend yield |
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|
0.0 |
% |
0.0 |
% |
0.0 |
% |
Expected volatility |
|
|
66.1 |
% |
65.5 |
% |
65.1 |
% |
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| Schedule of option activity under equity incentive plans |
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Weighted- |
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Average |
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Remaining |
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Shares Available |
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Number of Shares |
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Weighted-Average |
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Contractual Term |
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Aggregate |
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For Grant |
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Underlying Options |
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Exercise Price |
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(in years) |
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Intrinsic Value |
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Outstanding at January 1, 2020 |
|
16,615,971 |
|
22,670,704 |
|
$ |
3.51 |
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|
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Authorized for grant |
|
2,953,519 |
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— |
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Granted |
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(8,462,090) |
|
8,462,090 |
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$ |
2.32 |
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Exercised |
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— |
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(761,541) |
|
$ |
2.26 |
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Cancelled |
|
3,110,790 |
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(3,110,790) |
|
$ |
4.56 |
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Outstanding at December 31, 2020 |
|
14,218,190 |
|
27,260,463 |
|
$ |
3.05 |
|
6.46 |
|
$ |
23,679,303 |
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Vested and expected to vest at December 31, 2020 |
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|
|
26,159,213 |
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$ |
3.12 |
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Exercisable at December 31, 2020 |
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|
|
17,802,873 |
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$ |
3.42 |
|
5.25 |
|
$ |
12,628,388 |
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| Schedule of stock options by exercise price |
Details of our stock options by exercise price are as follows as of December 31, 2020:
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Options Outstanding |
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Options Exercisable |
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Number of |
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Weighted-Average |
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Outstanding |
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Remaining |
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Weighted-Average |
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Number of |
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Weighted-Average |
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Exercise Price |
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Options |
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Contractual Life (in years) |
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Exercise Price |
|
Options |
|
Exercise Price |
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$1.68 - $1.96 |
|
1,413,800 |
|
8.94 |
|
$ |
1.81 |
|
337,554 |
|
$ |
1.82 |
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$2.00 - $2.00 |
|
3,976,626 |
|
7.57 |
|
|
2.00 |
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2,374,499 |
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|
2.00 |
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$2.02 - $2.25 |
|
4,301,158 |
|
5.90 |
|
|
2.14 |
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3,681,576 |
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|
2.12 |
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$2.27 - $2.42 |
|
6,261,304 |
|
8.63 |
|
|
2.38 |
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1,617,712 |
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|
2.37 |
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$2.52 - $3.49 |
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3,831,521 |
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6.12 |
|
|
2.86 |
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2,760,475 |
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|
2.92 |
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$3.54 - $4.49 |
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5,130,353 |
|
5.41 |
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|
4.07 |
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4,685,356 |
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|
4.05 |
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$4.53 - $8.85 |
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2,345,701 |
|
1.18 |
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|
7.14 |
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2,345,701 |
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|
7.14 |
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$1.68 - $8.85 |
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27,260,463 |
|
6.46 |
|
|
3.05 |
|
17,802,873 |
|
|
3.42 |
|
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| Summary of weighted-average assumptions used to calculate fair value of purchase rights granted under Employee Stock Purchase Plan |
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Year Ended |
|
|
|
December 31, |
|
|
|
2020 |
|
2019 |
|
2018 |
|
Risk-free interest rate |
|
1.0 |
% |
2.7 |
% |
2.4 |
% |
Expected term (in years) |
|
1.6 |
|
1.5 |
|
1.3 |
|
Dividend yield |
|
0.0 |
% |
0.0 |
% |
0.0 |
% |
Expected volatility |
|
62.3 |
% |
62.6 |
% |
66.2 |
% |
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