EQUITY, SHARE-BASED COMPENSATION, WARRANTS AND FINANCING TRANSACTIONS, Options (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended												6 Months Ended	9 Months Ended	12 Months Ended
		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Common Stock [Member]
Shares Under Options, Outstanding [Roll Forward]
Cash exercised (in shares)		(10,000)		(78,734)		(77,078)		(32,500)
Stock Options [Member]
Shares Under Options, Outstanding [Roll Forward]
Outstanding at beginning of period (in shares)		923,234		1,036,763		950,727		892,520		916,484		639,658		950,727	950,727	639,658
Granted (in shares)		99,000	[1]	98,221	[1]	188,662	[1]	0	[1]	0		278,873	[1]
Cash exercised (in shares)		(10,000)		(78,734)	[2]	(77,078)		(32,500)		0	[2]	0
Forfeited (in shares)		(13,450)		(133,016)		(25,548)		(109,854)		(23,964)		(2,047)
Outstanding at end of period (in shares)		998,784		923,234		1,036,763		750,166		892,520		916,484		923,234	998,784	950,727	639,658
Options, Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period (in dollars per share)		$ 3.40		$ 3.20		$ 3.06		$ 2.49		$ 2.45		$ 8.83		$ 3.06	$ 3.06	$ 8.83
Granted (in dollars per share)	[1]	2.53		3.04		3.25						1.42
Cash exercised (in dollars per share)		0.85		1.10	[2]	0.78		0.85
Forfeited (in dollars per share)		11.42		2.92		5.66		1.61		1.21		5.02
Outstanding at end of period (in dollars per share)		3.23		3.40		3.20		$ 2.69		$ 2.49		2.45		$ 3.40	$ 3.23	$ 3.06	$ 8.83
Options, Weighted Average Grant Date Fair Value [Abstract]
Granted (in dollars per share)	[1]	$ 1.40		$ 1.84		$ 2.05						$ 0.97
Options, Weighted Average Remaining Contractual Life [Abstract]
Outstanding, weighted average remaining contractual life		8 years 4 months 24 days		8 years 4 months 24 days		8 years 7 months 6 days		8 years 1 month 6 days		8 years 4 months 24 days		8 years 8 months 12 days				8 years 6 months	7 years 2 months 12 days
Granted	[1]	10 years		10 years		10 years						10 years
Cash exercised		7 years 7 months 6 days		8 years 2 months 12 days	[2]	7 years 8 months 12 days		8 years 7 months 6 days
Forfeited		4 years 8 months 12 days		3 months 18 days		5 years 3 months 18 days		8 years 8 months 12 days		9 years 4 months 24 days		8 years
Options exercisable period															4 years
Incremental expense														$ 0.1
Stock Options [Member] | Common Stock [Member]
Shares Under Options, Outstanding [Roll Forward]
Cash exercised (in shares)														(31,955)
Options, Weighted Average Exercise Price [Roll Forward]
Cash exercised (in dollars per share)														$ 1.16

[1] The options granted vest and become exercisable in annual or monthly installments ending four years from the date of grant.

[2] Includes options for 31,955 shares of common stock at a weighted average exercise price of $1.16 per share for which we accelerated vesting upon termination of employment for an employee in June of 2019. We expensed $0.1 million of incremental expense upon acceleration of vesting.