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STOCK-BASED COMPENSATION - Summary of Stock Options Outstanding (Details) shares in Thousands | 6 Months Ended
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Jun. 30, 2021 $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |
Options outstanding, number of shares (shares) | shares | 2,332
Options outstanding - weighted- average remaining life | 3 years 3 months 18 days
Options outstanding - weighted- average exercise price (usd per share) | $ 1.96
Options exercisable - number of shares exercisable (shares) | shares | 2,231
Options Exercisable - weighted-average exercise price (usd per share) | $ 1.97
$0.70 —– $1.11 |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |
Exercise price range, lower limit (usd per share) | 0.70
Exercise price range, upper limit (usd per share) | $ 1.11
Options outstanding, number of shares (shares) | shares | 512
Options outstanding - weighted- average remaining life | 3 years 9 months 18 days
Options outstanding - weighted- average exercise price (usd per share) | $ 0.85
Options exercisable - number of shares exercisable (shares) | shares | 501
Options Exercisable - weighted-average exercise price (usd per share) | $ 0.85
$1.29 —– $1.29 |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |
Exercise price range, lower limit (usd per share) | 1.29
Exercise price range, upper limit (usd per share) | $ 1.29
Options outstanding, number of shares (shares) | shares | 1,000
Options outstanding - weighted- average remaining life | 3 years 2 months 12 days
Options outstanding - weighted- average exercise price (usd per share) | $ 1.29
Options exercisable - number of shares exercisable (shares) | shares | 937
Options Exercisable - weighted-average exercise price (usd per share) | $ 1.29
$1.31 —– $1.31 |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |
Exercise price range, lower limit (usd per share) | 1.31
Exercise price range, upper limit (usd per share) | $ 1.31
Options outstanding, number of shares (shares) | shares | 556
Options outstanding - weighted- average remaining life | 2 years 9 months 18 days
Options outstanding - weighted- average exercise price (usd per share) | $ 1.31
Options exercisable - number of shares exercisable (shares) | shares | 556
Options Exercisable - weighted-average exercise price (usd per share) | $ 1.31
$1.39 —– $14.58 |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |
Exercise price range, lower limit (usd per share) | 1.39
Exercise price range, upper limit (usd per share) | $ 14.58
Options outstanding, number of shares (shares) | shares | 253
Options outstanding - weighted- average remaining life | 3 years 4 months 24 days
Options outstanding - weighted- average exercise price (usd per share) | $ 5.64
Options exercisable - number of shares exercisable (shares) | shares | 226
Options Exercisable - weighted-average exercise price (usd per share) | $ 5.90
$64.17 —– $64.17 |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |
Exercise price range, lower limit (usd per share) | 64.17
Exercise price range, upper limit (usd per share) | $ 64.17
Options outstanding, number of shares (shares) | shares | 11
Options outstanding - weighted- average remaining life | 5 years 10 months 24 days
Options outstanding - weighted- average exercise price (usd per share) | $ 64.17
Options exercisable - number of shares exercisable (shares) | shares | 11
Options Exercisable - weighted-average exercise price (usd per share) | $ 64.17

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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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