Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 96,713	$ 72,797
Prepaid expenses and other current assets	3,370	1,298
Total current assets	100,083	74,095
Property and equipment, net	9,205	10,546
Restricted cash	1,092	1,092
Other assets	59	38
Total assets	110,439	85,771
Current liabilities:
Accounts payable	2,186	1,263
Accrued expenses and other current liabilities	5,496	2,497
Deferred lease incentive, current portion	469	469
Deferred revenue, current portion	3,989
Total current liabilities	12,140	4,229
Deferred rent, excluding current portion	1,559	1,402
Deferred lease incentive, excluding current portion	3,521	3,990
Deferred revenue, excluding current portion	6,011
Other liabilities, excluding current portion	55	150
Total liabilities	23,286	9,771
Commitments and contingencies (Note 11)
Stockholders’ equity (deficit):
Preferred stock, $0.001 par value; 5,000,000 shares authorized as of December 31, 2019; no shares issued or outstanding as of December 31, 2019
Common stock, $0.001 par value; 200,000,000 and 135,000,000 shares authorized as of December 31, 2019 and December 31, 2018, respectively; 23,335,514 and 2,791,764 shares issued as of December 31, 2019 and December 31, 2018, respectively; 22,654,444 and 1,587,953 shares outstanding as of December 31, 2019 and December 31, 2018, respectively	23	2
Additional paid-in capital	237,931	4,452
Accumulated deficit	(150,801)	(68,124)
Total stockholders’ equity (deficit)	87,153	(63,670)
Total liabilities, convertible preferred stock, and stockholders’ equity (deficit)	$ 110,439	85,771
Series A Convertible Preferred Stock
Current liabilities:
Convertible preferred stock		59,909
Series B Convertible Preferred Stock
Current liabilities:
Convertible preferred stock		$ 79,761