CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 20,634	$ 30,908
Restricted cash	67	67
Trade receivables, net of allowances	234	173
Amount due from sale of MST Franchise	0	5,000
Prepaid and other expenses	2,024	2,127
Total Current Assets	22,959	38,275
Non-current prepaid expenses and other assets	2,000	2,483
Total Assets	24,959	40,758
Current Liabilities:
Trade payables	1,159	2,386
Accrued expenses	4,379	4,381
Employee related obligations	836	2,372
Liability for employee severance benefits	0	206
Total Current Liabilities	6,374	9,345
Other liabilities	1,313	0
Total Liabilities	7,687	9,345
Commitments and Contingencies
Mezzanine Equity:
Temporary equity, carrying amount, including portion attributable to noncontrolling interests	0	211
Stockholders' Equity:
Common stock: $0.0001 par value; 150,000,000 shares authorized at June 30, 2023 and December 31, 2022; 3,282,479 and 3,229,704 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	0	0
Additional paid-in capital	695,836	693,937
Accumulated deficit	(678,564)	(662,735)
Total Stockholders' Equity	17,272	31,202
Total Liabilities, Mezzanine Equity and Stockholders’ Equity	$ 24,959	$ 40,758