Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 47,245	$ 64,788
Short-term marketable securities	78,040	71,612
Prepaid expenses and other current assets	933	1,649
Total current assets	126,218	138,049
Right of use asset	226
Other assets	177	69
Total assets	126,621	138,118
Current liabilities:
Accounts payable	1,535	947
Accrued expenses and other current liabilities	6,751	8,422
Total current liabilities	8,286	9,369
Other liabilities	12	23
Total liabilities	8,298	9,392
Commitments and contingencies (Note 11)
Stockholders’ equity:
Common stock, $0.0001 par value, 150,000,000 shares authorized as of March 31, 2020 and December 31, 2019; 28,671,222 and 28,567,837 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	3	3
Additional paid-in capital	260,481	259,049
Accumulated other comprehensive gain (loss)	45	(6)
Accumulated deficit	(142,206)	(130,320)
Total stockholders’ equity	118,323	128,726
Total liabilities and stockholders’ equity	$ 126,621	$ 138,118