CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (23,877)	$ (9,236)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	28	49
Accretion of discount on marketable securities	(41)	0
Non-cash interest expense	666	0
Impairment expense	441	0
Change in fair value of derivative liability	11	0
Change in fair value of warrant liability	(223)	(244)
Change in fair value of contingent consideration	(145)	(3)
Gain on extinguishment	(2,318)	0
Amortization of discounts and financing costs	1,575	489
Stock-based compensation	1,532	711
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(4,562)	(115)
Accounts payable	(1,822)	2,845
Accrued liabilities	671	(241)
Deferred revenue	(7,917)	9,712
Net cash provided by (used in) operating activities	(35,981)	3,967
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash and cash equivalents acquired in recapitalization	13,017	0
Maturities of marketable securities	19,500	0
Capital expenditures	(7)	(12)
Net cash provided by (used in) investing activities	32,510	(12)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of principal of note payable	(4,808)	(1,282)
Payment of issuance costs associated with note payable	0	(50)
Proceeds from issuance of convertible promissory notes	7,397	0
Proceeds from the exercise of warrants	47	0
Proceeds from the exercise of stock options	0	45
Net cash provided by (used in) financing activities	2,636	(1,287)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(835)	2,668
CASH AND CASH EQUIVALENTS—BEGINNING	8,067	5,399
CASH AND CASH EQUIVALENTS—ENDING	7,232	8,067
Supplement Disclosure of Cash Flow Information:
Interest paid	432	608
Supplement Disclosure of Non-Cash Investing and Financing Activities:
Conversion of redeemable convertible preferred stock and preferred stock dividends to common stock	48,016	0
Accretion (reduction) of redeemable convertible preferred stock to redemption value	(10,377)	5,896
Shares issued in recapitalization	23,076	0
Conversion of the convertible promissory notes and interest to common stock	8,063	0
Accretion of redeemable convertible preferred stock issuance costs	103	40
Derivative liability issued with convertible promissory notes	1,442	0
Warrants to purchase common stock issued with funding agreement	876	0
Warrants to purchase common stock issued with convertible promissory notes	1,492	0
Change in unrealized loss on available-for-sale marketable securities	$ (28)	$ 0