REVENUE (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	$ 5,245,555	$ 3,041,012	$ 9,678,852	$ 5,637,145
Grant and other income:
Revenue from Grants	509,883	525,214	1,001,239	1,042,599
Total revenue	5,755,438	3,566,226	10,680,091	6,679,744
United States
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	58,500	14,000	87,900	24,000
Grant and other income:
Revenue from Grants	509,883	525,214	1,001,239	1,042,599
Germany
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	3,232,279	1,809,675	5,850,674	3,339,417
All other countries
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	1,954,776	1,217,337	3,740,278	2,273,728
Direct [Member]
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	4,017,964	2,180,063	7,359,164	4,052,741
Grant and other income:
Total revenue	4,017,964	2,180,063	7,359,164	4,052,741
Direct [Member] | United States
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	58,500	14,000	87,900	24,000
Grant and other income:
Revenue from Grants	0	0	0	0
Direct [Member] | Germany
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	3,232,279	1,809,675	5,850,674	3,339,417
Direct [Member] | All other countries
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	727,185	356,388	1,420,590	689,324
Distributors and Strategic Partners [Member]
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	1,227,591	860,949	2,319,688	1,584,404
Grant and other income:
Total revenue	1,227,591	860,949	2,319,688	1,584,404
Distributors and Strategic Partners [Member] | United States
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Grant and other income:
Revenue from Grants	0	0	0	0
Distributors and Strategic Partners [Member] | Germany
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Distributors and Strategic Partners [Member] | All other countries
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	1,227,591	860,949	2,319,688	1,584,404
United States Government Agencies [Member]
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Grant and other income:
Total revenue	509,883	525,214	1,001,239	1,042,599
United States Government Agencies [Member] | United States
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Grant and other income:
Revenue from Grants	509,883	525,214	1,001,239	1,042,599
United States Government Agencies [Member] | Germany
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
United States Government Agencies [Member] | All other countries
Product sales:
Revenue from Contract with Customer, Including Assessed Tax	$ 0	$ 0	$ 0	$ 0