EQUITY, SHARE-BASED COMPENSATION, WARRANTS AND FINANCING TRANSACTIONS, Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended										9 Months Ended		12 Months Ended
		Feb. 29, 2016	Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019	Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock Award Activity, Number [Roll Forward]
Beginning balance, Nonvested (in shares)			134,984	[1]	193,965		193,965	208,875	[1]	384,744		384,744	193,965	384,744	384,744
Granted (in shares)							0					0
Vested (in shares)			0		(193,965)		0	0		(384,744)		0
Ending balance, Nonvested (in shares)			150,274		134,984	[1]	193,965	208,875		208,875	[1]	384,744	150,274	208,875	193,965	384,744
Unrecognized Stock Compensation [Abstract]
Unrecognized stock compensation	[2]		$ 374	[1]	$ 81		$ 173	$ 360	[1]	$ 80		$ 176	$ 173	$ 176	$ 176
Unrecognized stock compensation	[2]		$ 313		$ 374	[1]	$ 81	$ 267		$ 360	[1]	$ 80	$ 313	$ 267	$ 173	$ 176
Weighted Average Remaining Vesting and Expense Period [Abstract]
Common stock issued (in shares)							0					0
Vested (in shares)			0		193,965		0	0		384,744		0
Restricted Stock Award Activity, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance, Nonvested (in dollars per share)			$ 2.86	[1]	$ 1.84		$ 1.84	$ 1.78	[1]	$ 0.94		$ 0.94	$ 1.84	$ 0.94	$ 0.94
Vested (in dollars per share)					1.84					0.94
Ending balance, Nonvested (in dollars per share)			$ 2.86		$ 2.86	[1]	$ 1.84	$ 1.78		$ 1.78	[1]	$ 0.94	$ 2.86	$ 1.78	$ 1.84	$ 0.94
Restricted Stock Award Activity, Fair Value [Abstract]
Vested, Fair Value	[3]				$ 566					$ 686
Nonvested, Fair Value	[3]		$ 393		$ 393	[1]	$ 722	$ 599		$ 451	[1]	$ 315			$ 582	$ 569
Consultant [Member]
Restricted Stock Award Activity, Number [Roll Forward]
Granted (in shares)					16,873					0
Weighted Average Remaining Vesting and Expense Period [Abstract]
Common stock issued (in shares)					16,873					0
Restricted Stock Award Activity, Weighted Average Grant Date Fair Value [Abstract]
Granted (in dollars per share)					$ 2.86
Restricted Stock Award Activity, Fair Value [Abstract]
Granted, Fair Value	[3]				$ 48
Directors [Member]
Restricted Stock Award Activity, Number [Roll Forward]
Granted (in shares)			15,290		118,111			0		208,875
Weighted Average Remaining Vesting and Expense Period [Abstract]
Common stock issued (in shares)			15,290		118,111			0		208,875
Restricted Stock Award Activity, Weighted Average Grant Date Fair Value [Abstract]
Granted (in dollars per share)			$ 2.82		$ 2.86					$ 1.78
Restricted Stock Award Activity, Fair Value [Abstract]
Granted, Fair Value	[3]		$ 43		$ 338					$ 372
Restricted Stock Units [Member]
Restricted Stock Award Activity, Number [Roll Forward]
Beginning balance, Nonvested (in shares)			1,097,062		1,215,000		1,215,000	300,000		470,000		1,175,000	1,215,000	1,175,000	1,175,000
Cancelled (in shares)							0					(705,000)
Granted (in shares)			81,000		132,062			0		0			1,178,062
Forfeited (in shares)			0		(250,000)			(130,000)		(170,000)
Ending balance, Nonvested (in shares)			1,178,062		1,097,062		1,215,000	170,000		300,000		470,000	1,178,062	170,000	1,215,000	1,175,000
Unrecognized Stock Compensation [Abstract]
Unrecognized stock compensation			$ 492		$ 606		$ 683	$ 78		$ 119		$ 161	$ 683	$ 161	$ 161
Granted			38		107			0		0
Cancelled							0					(31)
Expensed			(70)		(66)		(77)	(4)		(11)		(11)
Forfeited			0		(155)			(39)		(30)
Unrecognized stock compensation			$ 460		$ 492		$ 606	$ 35		$ 78		$ 119	$ 460	$ 35	$ 683	$ 161
Weighted Average Remaining Vesting and Expense Period [Abstract]
Weighted average expense period (Years)			1 year 8 months 12 days		1 year 10 months 24 days		2 years	2 years 3 months 18 days		2 years 6 months		2 years 9 months 18 days			2 years 3 months 18 days	3 years
Granted			2 years 8 months 12 days		2 years 3 months 18 days
Common stock issued (in shares)			81,000		132,062			0		0			1,178,062
Restricted Stock Award Activity, Fair Value [Abstract]
Unrecognized compensation amortizing period													8 months 12 days	8 months 12 days
Restricted Stock Units [Member] | Minimum [Member]
Weighted Average Remaining Vesting and Expense Period [Abstract]
Award vesting period													1 year
Restricted Stock Units [Member] | Maximum [Member]
Weighted Average Remaining Vesting and Expense Period [Abstract]
Award vesting period													5 years
Restricted Stock Units [Member] | Supplier [Member]
Restricted Stock Award Activity, Fair Value [Abstract]
Shares issued to supplier, nonvested and unearned (in shares)		950,000			830,104
Fixed price per share held in escrow by supplier (in dollars per share)		$ 2.80			$ 2.92		$ 2.92			$ 2.16		$ 1.57
Cumulative shares released from escrow (in shares)			119,896										119,896
Shares released from escrow during period (in shares)					11,492		9,148			10,660		9,842
Vesting Price Equals or Exceeds $5.00 [Member] | Restricted Stock Units [Member]
Restricted Stock Award Activity, Number [Roll Forward]
Vested (in shares)													(117,806)
Weighted Average Remaining Vesting and Expense Period [Abstract]
Number of trading days													65 days
Vested (in shares)													117,806
Vesting price (in dollars per share)													$ 5.00
Vesting Price Equals or Exceeds $10.00 [Member] | Restricted Stock Units [Member]
Restricted Stock Award Activity, Number [Roll Forward]
Vested (in shares)													(353,419)
Weighted Average Remaining Vesting and Expense Period [Abstract]
Vested (in shares)													353,419
Vesting price (in dollars per share)													$ 10.00
Vesting Price Equals or Exceeds $15.00 [Member] | Restricted Stock Units [Member]
Restricted Stock Award Activity, Number [Roll Forward]
Vested (in shares)													(706,837)
Weighted Average Remaining Vesting and Expense Period [Abstract]
Vested (in shares)													706,837
Vesting price (in dollars per share)													$ 15.00

[1] Excluded 830,104 shares, issued to a supplier, nonvested and unearned as of June 30, 2019. In February 2016, we issued 950,000 shares of common stock to that supplier. The shares were being held in escrow until earned (as defined in our agreement) by the supplier at a fixed price of $2.80 per share. Cumulatively, as of September 30, 2019, 119,896 shares were released from escrow. We recalled and retired the shares remaining in escrow, after the related supply agreement terminated in August 2019. During the three months ended June 30, 2019 and March 31, 2019, we released from escrow and expensed the value of 11,492 and 9,148 shares earned by a vendor, at $2.92 per share, the fair value of the shares on January 1, 2019, when we adopted ASU 2018-07. During the three months ended June 30, 2018 and March 31, 2018, we released from escrow and expensed the value of 10,660 shares ($2.16 per share) and 9,842 ($1.57 per share) shares earned by that vendor. The shares released from escrow in 2018 were valued at the fair value of the shares when earned, under the guidance for nonemployee awards in effect in 2018, prior to our adoption of ASU 2018-07.

[2] As of September 30, 2019 and 2018, unrecognized compensation is amortizing over a remaining period of 0.7 years.

[3] Represents pre-tax fair value, based on our closing stock prices, which would have been received by the holders of the stock had all such holders sold their underlying shares on the date indicated, the dates of grant or the dates of vesting, as applicable.