Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash	$ 6,744	$ 2,543
Prepaid expenses and other current assets	739	579
Total current assets	7,483	3,122
Property and equipment, net	1,741	1,700
Restricted cash	100	100
Other assets	2,659	138
Total assets	11,983	5,060
Current liabilities:
Current portion of capital lease obligations		239
Current portion of equipment loan payable	144	212
Current portion of long-term debt	305
Accounts payable	2,627	548
Accrued expenses and other current liabilities	2,330	666
Total current liabilities	5,406	1,665
Equipment loan payable, net of current portion	16	113
Long-term debt, net of current portion	195
Warrant liability	7,071
Deferred rent	11	18
Total liabilities	12,699	1,796
Commitments and contingencies (Note 10)
Series A convertible preferred stock, $0.0001 par value; 45,000,000 and 30,000,000 shares authorized and 5,670,184 and 4,443,259 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively (liquidation value of $51,033 at September 30, 2020)	48,369	38,894
Stockholders' deficit:
Common stock, $0.0001 par value; 200,000,000 and 50,000,000 shares authorized and 1,124,616 and 1,099,270 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively
Additional paid-in capital	1,236	927
Accumulated deficit	(50,321)	(36,557)
Total stockholders' deficit	(49,085)	(35,630)
Total liabilities, convertible preferred stock, and stockholders' deficit	$ 11,983	$ 5,060