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STOCK INCENTIVE PLANS - Summary of Option, Unvested RSU Activity under 2014 Equity Incentive Plan and 2016 Inducement Equity Incentive Plan and Related Information (Details) | 6 Months Ended
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Jun. 30, 2024 $ / shares shares
Shares Available for Grant |
Shares available for grant beginning balance (in shares) | 869,111
Additional options authorized (in shares) | 6,748,645
Common stock awards for services (in shares) | (11,748)
RSUs granted (in shares) | (3,360,339)
Options granted (in shares) | (854,898)
Repurchase of common stock under employee incentive plans (in shares) | 391,535
RSUs forfeited (in shares) | 247,195
Options forfeited (in shares) | 21,809
Options expired (in shares) | 85,247
Shares available for grant ending balance (in shares) | 4,136,557
Stock Options Outstanding |
Stock options outstanding beginning balance (in shares) | 3,055,208
Stock options granted (in shares) | 854,898
Stock options exercised (in shares) | (20,037)
Stock options forfeited (in shares) | (21,809)
Stock options expired (in shares) | (85,247)
Stock options outstanding ending balance (in shares) | 3,783,013
Weighted- Average Exercise Price |
Weighted average exercise price beginning balance (in dollars per share) | $ / shares | $ 25.21
Weighted average exercise price - options granted (in dollars per share) | $ / shares | 9.29
Weighted average exercise price - options exercised (in dollars per share) | $ / shares | 6.54
Weighted average exercise price - options forfeited (in dollars per share) | $ / shares | 27.94
Weighted average exercise price - options expired (in dollars per share) | $ / shares | 30.19
Weighted average exercise price ending balance (in dollars per share) | $ / shares | $ 21.58
Number of RSU Shares |
RSUs granted (in shares) | 3,360,339
RSUs forfeited (in shares) | (247,195)
Restricted Stock Units |
Shares Available for Grant |
RSUs granted (in shares) | (3,360,339)
RSUs forfeited (in shares) | 247,195
Number of RSU Shares |
Number of RSU shares beginning balance (in shares) | 5,006,775
RSUs granted (in shares) | 3,360,339
RSUs vested (in shares) | (1,456,490)
RSUs forfeited (in shares) | (247,195)
Number of RSU shares ending balance (in shares) | 6,663,429
Weighted- Average Grant Date Fair Value |
Weighted average grant date fair value beginning balance (in dollars per share) | $ / shares | $ 19.02
Weighted average grant date fair value - RSUs granted (in dollars per share) | $ / shares | 9.32
Weighted average grant date fair value - RSUs vested (in dollars per share) | $ / shares | 18.14
Weighted average grant date fair value - RSUs forfeited (in dollars per share) | $ / shares | 17.32
Weighted average grant date fair value ending balance (in dollars per share) | $ / shares | $ 14.54

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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