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INCOME TAXES - Net Operating Losses and Credit Carryforwards (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |
Reduction of income tax provision due to tax holidays | $ 1,700 | $ 1,900 | $ 1,300
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | 124,115 |  |
Credit carryforwards | 24,372 |  |
Net operating losses expected to expire unused | 29,500 |  |
Tax credits expected to expire unused | 100 |  |
Carryforwards with unlimited carryforward period | 47,300 |  |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | 9,149 |  |
Credit carryforwards | 1,895 |  |
Net operating losses expected to expire unused | 800 |  |
Tax credits expected to expire unused | 9,000 |  |
Carryforwards with unlimited carryforward period | 1,200 |  |
OpenSpan, Inc. | Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | 76,826 |  |
Credit carryforwards | 640 |  |
OpenSpan, Inc. | State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | 1,466 |  |
Credit carryforwards | $ 60 |  |

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- Definition The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330215-122817 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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