CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (13,041)	$ (11,873)
Adjustment to reconcile net loss to net cash used in operating activities:
Non-cash stock-based compensation	437	426
Change in operating lease right of use assets	98	0
Change in fair value of common stock warrants	(25)	(1,108)
Change in fair value of contingent consideration	268	510
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(588)	(480)
Accounts payable	(2,123)	(227)
Accrued expenses and other current liabilities	1,133	(715)
Net cash used in operating activities	(13,841)	(13,467)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of offering costs	14,455	13,652
Collection of stock subscription receivable	308	0
Net proceeds from exercise of warrants	4	3,598
Net cash provided by financing activities	14,767	17,250
Net increase in cash, cash equivalents, restricted cash, and restricted cash equivalents	926	3,783
Cash, cash equivalents, restricted cash, and restricted cash equivalents at the beginning of period	7,377	5,451
Cash, cash equivalents, restricted cash, and restricted cash equivalents at the end of period	8,303	9,234
Supplemental disclosure of cash flow information:
Cash received during the period for interest	25	87
Supplemental disclosure of non-cash investing and financing activities:
Operating right of use asset and current and non-current lease liability	976	550
Impact of anti-dilution protection on liability-classified warrants	0	243
Offering expenses in accounts payable and accrued expenses and other current liabilities	0	236
Reclassification Of Warrant Liability Upon Exercise	$ 0	$ 68