NOTE PAYABLE - Narrative (Details) - USD ($)				8 Months Ended	9 Months Ended		29 Months Ended
	Sep. 03, 2019	Jun. 02, 2018	Feb. 18, 2016	Jul. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 31, 2018
Debt Instrument [Line Items]
Payments of principal of note payable	$ (2,600,000)				$ (4,808,000)	$ (509,000)
Payment of associated accrued interest and aggregate end-of-term payment	$ 600,000
Note Payable
Debt Instrument [Line Items]
Face amount			$ 7,500,000
End of term payment rate			4.50%
Applicable percent of aggregate unfunded term loan commitments			50.00%
Increase in termination payment				$ 100,000
Facility fees							$ 200,000
Interest Rate Option 1 | Note Payable
Debt Instrument [Line Items]
Stated rate			9.20%
Interest Rate Option 2 | Note Payable
Debt Instrument [Line Items]
Stated rate			9.20%
Interest Rate Option 2 | Note Payable | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate			3.50%
Hercules Capital Warrants
Debt Instrument [Line Items]
Warrants converted (in shares)		9,005
Exercise price (in usd per share)		$ 33.31
Warrant liability		$ 300,000