Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 44,314	$ 24,872
Short term investments	83,974	46,844
Restricted cash	250
Prepaid expenses and other current assets	5,105	868
Total current assets	133,643	72,584
Property and equipment, net	265	283
Right-of-use assets	1,086
Long term investments	7,988
Other assets	260	10
Total assets	143,242	72,877
Current liabilities:
Accounts Payable	5,116	495
Accrued expenses and other current liabilities	1,909	962
Total current liabilities	7,025	1,457
Total liabilities	7,025	1,457
Commitments and contingencies (Note 6)
Stockholders’ deficit:
Preferred Stock, $0.001 par value, 10,000,000 authorized, no shares issued and outstanding June 30, 2019 and no shares authorized, issued and outstanding at December 31, 2018
Common stock, $0.001 par value, 100,000,000 and 24,794,114 shares authorized, 26,841,149 and 3,412,366 issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	27	3
Additional paid in capital	183,678	245
Accumulated other comprehensive profit (loss)	80	(49)
Accumulated deficit	(47,568)	(32,825)
Total stockholders’ equity / (deficit)	136,217	(32,626)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity / (deficit)	$ 143,242	72,877
Series A Redeemable Convertible Preferred Stock
Current liabilities:
Series A redeemable convertible preferred stock, par value $0.001, no shares authorized, issued and outstanding as of June 30, 2019 and 9,008,931 shares authorized, 9,008,919 shares issued and outstanding December 31, 2018; liquidation preference of $0 and $17,178 at June 30, 2019 and December 31, 2018, respectively		17,178
Series B Redeemable Convertible Preferred Stock
Current liabilities:
Series A redeemable convertible preferred stock, par value $0.001, no shares authorized, issued and outstanding as of June 30, 2019 and 9,008,931 shares authorized, 9,008,919 shares issued and outstanding December 31, 2018; liquidation preference of $0 and $17,178 at June 30, 2019 and December 31, 2018, respectively		$ 86,868