ORGANIZATION AND BASIS OF PRESENTATION - Deferred Revenue, by Arrangement (Details)	6 Months Ended
Jun. 30, 2019 USD ($)
ORGANIZATION AND BASIS OF PRESENTATION
Deferred revenue	$ 3,028,787
Cash received	3,414,210
Revenue recognized	3,266,346
Deferred revenue	$ 3,176,651

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

No definition available.

Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant