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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Significant Accounting Policies [Line Items] |  |
General payment terms upon completion of performance obligation | 30 days |
Cash and cash equivalents | $ 257,413 | $ 243,796
Software |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful life (in years) | 3 years |
Held outside the United States |  |
Significant Accounting Policies [Line Items] |  |
Cash and cash equivalents | $ 217,100 | $ 230,900
Maximum |  |
Significant Accounting Policies [Line Items] |  |
Typical contract term | 1 year |
Transportation services |  |
Significant Accounting Policies [Line Items] |  |
General payment terms upon completion of performance obligation | 30 days |
Value-added logistics services |  |
Significant Accounting Policies [Line Items] |  |
General payment terms upon completion of performance obligation | 30 days |
Sourcing services | Minimum |  |
Significant Accounting Policies [Line Items] |  |
General payment terms upon completion of performance obligation | 20 days |
Sourcing services | Maximum |  |
Significant Accounting Policies [Line Items] |  |
General payment terms upon completion of performance obligation | 30 days |
Logistics and transportation |  |
Significant Accounting Policies [Line Items] |  |
General payment terms upon completion of performance obligation | 30 days |
Logistics and transportation | Maximum |  |
Significant Accounting Policies [Line Items] |  |
Typical contract term | 1 year |
Stock awards | Minimum |  |
Significant Accounting Policies [Line Items] |  |
Stock award vesting period (in years) | 3 years |
Stock awards | Maximum |  |
Significant Accounting Policies [Line Items] |  |
Stock award vesting period (in years) | 5 years |
Restricted shares and restricted stock units | Minimum |  |
Significant Accounting Policies [Line Items] |  |
Shares and restricted units grants, discount for post-vesting holding restrictions (percent) | 12.00% |
Restricted shares and restricted stock units | Maximum |  |
Significant Accounting Policies [Line Items] |  |
Shares and restricted units grants, discount for post-vesting holding restrictions (percent) | 24.00% |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value. + 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 (f)(2)(v) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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