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ORDINARY SHARE AND SHARE INCENTIVE PLANS - Stock Option Activity (Details) - 2017 Equity Incentive Plan - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Number of shares outstanding |  |
Options Outstanding at the beginning of the period (in shares) | 181 | 206
Options granted (in shares) | 875 |
Options exercised (in shares) |  | (25)
Options Outstanding at the end of the period (in shares) | 1,056 | 181
Weighted average exercise price |  |
Options Outstanding at the beginning of the period (in dollars per share) | $ 2.24 | $ 2.24
Options granted (in dollars per share) | 1.14 |
Options exercised (in dollars per share) |  | 2.24
Options Outstanding at the end of the period (in dollars per share) | $ 1.33 | $ 2.24

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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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