SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Technology Investment Agreement (TIA) (Details)	6 Months Ended
Jun. 30, 2021 USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Research and development agreement with government funding amount	$ 81,029,518

The amount of customer funding recorded as an offset to costs incurred for a fixed-price, best-efforts research and development cost-sharing arrangement with the Federal Government.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 730
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6472174&loc=d3e58812-109433

Name:	us-gaap_ResearchAndDevelopmentArrangementWithFederalGovernmentCustomerFundingToOffsetCostsIncurred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration