CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 30,213	$ 30,908
Restricted cash	67	67
Trade receivables, net of allowances	105	173
Amount due from sale of MST Franchise	0	5,000
Prepaid and other expenses	2,637	2,127
Total Current Assets	33,022	38,275
Non-current prepaid expenses and other assets	2,241	2,483
Total Assets	35,263	40,758
Current Liabilities:
Trade payables	2,214	2,386
Accrued expenses	4,189	4,381
Employee related obligations	910	2,372
Liability for employee severance benefits	206	206
Total Current Liabilities	7,519	9,345
Other liabilities	1,313	0
Total Liabilities	8,832	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 March 31, 2023 and December 31, 2022; 3,271,282 and 3,229,704 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively	0	0
Additional paid-in capital	694,937	693,937
Accumulated deficit	(668,506)	(662,735)
Total Stockholders' Equity	26,431	31,202
Total Liabilities, Mezzanine Equity and Stockholders’ Equity	$ 35,263	$ 40,758