Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 20,634	$ 24,872
Short term investments	38,410	46,844
Restricted cash	250
Prepaid expenses and other current assets	4,496	868
Total current assets	63,790	72,584
Property and equipment, net	314	283
Right-of-use asset	815
Long term investments	5,416
Other assets	261	10
Total assets	70,596	72,877
Current liabilities:
Accounts Payable	1,946	495
Accrued expenses and other current liabilities	1,724	962
Short-term lease liability	340
Total current liabilities	4,010	1,457
Long-term lease liability	475
Total liabilities	4,485	1,457
Commitments and contingencies (Note 6)
Stockholders’ deficit:
Common stock, $0.001 par value, 24,794,114 and 24,794,114 shares authorized, 3,566,923 and 3,412,366 issued and outstanding as of March 31, 2019 and December 31, 2018, respectively	4	3
Additional paid in capital	498	245
Accumulated other comprehensive loss	(23)	(49)
Accumulated deficit	(38,506)	(32,825)
Total stockholders’ deficit	(38,027)	(32,626)
Total liabilities, redeemable convertible preferred stock and stockholders’ deficit	70,596	72,877
Series A Redeemable Convertible Preferred Stock
Current liabilities:
Series A redeemable convertible preferred stock, par value $0.001, 9,008,931 shares authorized, 9,008,919 shares issued and outstanding as of March 31, 2019 and December 31, 2018, respectively; liquidation preference of $17,178 at March 31, 2019 and December 31, 2018, respectively	17,178	17,178
Series B Redeemable Convertible Preferred Stock
Current liabilities:
Series A redeemable convertible preferred stock, par value $0.001, 9,008,931 shares authorized, 9,008,919 shares issued and outstanding as of March 31, 2019 and December 31, 2018, respectively; liquidation preference of $17,178 at March 31, 2019 and December 31, 2018, respectively	$ 86,960	$ 86,868