Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 85,606	$ 51,214
Short term investments	76,810	48,650
Prepaid expenses and other current assets	6,172	6,192
Total current assets	168,588	106,056
Property and equipment, net	624	709
Operating lease right-of-use assets, net	637	625
Long term investments	61,139	16,763
Other assets	217	217
Total assets	231,205	124,370
Current liabilities:
Accounts payable	4,954	3,075
Accrued expenses and other current liabilities	8,153	5,817
Total current liabilities	13,107	8,892
Long-term operating lease liability	57
Total liabilities	13,164	8,892
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000,000 authorized, no shares issued and outstanding as of March 31, 2020 and December 31, 2019
Common stock, $0.001 par value, 100,000,000 shares authorized, 29,404,540 and 26,869,413 issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	29	27
Additional paid in capital	305,030	185,196
Accumulated other comprehensive income (loss)	(37)	60
Accumulated deficit	(86,981)	(69,805)
Total stockholders’ equity	218,041	115,478
Total liabilities, redeemable convertible preferred stock and stockholders’ equity	$ 231,205	$ 124,370