Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 42,739	$ 53,480
Accounts receivable		30
Prepaid expenses and other current assets	2,477	2,156
Total current assets	45,216	55,666
Property and equipment, net	1,775	1,911
Restricted cash	622	622
Operating lease right-of-use asset	4,286	4,571
TOTAL ASSETS	51,899	62,770
CURRENT LIABILITIES:
Accounts payable	1,498	718
Accrued expenses and other current liabilities	1,764	3,704
Operating lease liabilities	1,262	1,227
Current portion of long-term debt	3,298	3,295
Current portion of deferred revenue	8,694	10,639
Total current liabilities	16,516	19,583
Long-term debt, net of issuance costs and discount	4,217	5,006
Operating lease liabilities, net of current portion	3,397	3,725
Deferred revenue, net of current portion	2,858	3,729
Total liabilities	26,988	32,043
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS’ EQUITY:
Preferred stock, par value of $0.0001 per share; 25,000,000 shares authorized; no shares issued and outstanding as of March 31, 2022 and December 31, 2021.
Common stock, par value of $0.0001 per share; 175,000,000 shares authorized; 32,962,733 and 32,952,306 shares issued and outstanding as of March 31, 2022 and December 31, 2021, respectively	3	3
Additional paid-in capital	171,590	170,744
Accumulated deficit	(146,682)	(140,020)
Total stockholders’ equity	24,911	30,727
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 51,899	$ 62,770