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INCOME TAX EXPENSE - Income tax reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
INCOME TAX EXPENSE
Loss before income tax	$ (79,512,792)	$ (71,476,322)	$ (42,397,279)
PRC statutory income tax rate	25.00%	25.00%	25.00%
Income tax credit computed at PRC statutory income tax rate	$ (19,878,198)	$ (17,869,081)	$ (10,599,320)
Impact of PRC preferential income tax rate as qualified TASE	7,951,279	7,147,633	4,239,728
Difference in income tax rates of overseas entities	10,560,029	10,549,985	5,286,487
Research and development super-deduction	(1,724,740)	(569,016)	(718,979)
Research and development tax credits	(569,575)
Nondeductible expenses	3,695	1,054	1,238
Foreign derived intangible income deduction	(487,183)
Changes in valuation allowance	4,517,358	2,277,418	$ 1,790,846
State tax	76,127	291,500
Others	(10,263)	127,880
Income tax expense	$ 459,055	$ 1,701,613

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for research and development.

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Amount of reported income tax benefit from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to foreign-derived intangible income (FDII).

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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