CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 168,645	$ 122,661
Short-term investments	168,347	233,663
Accrued interest	469	450
Prepaid expenses and other current assets	2,203	4,543
Total current assets	339,664	361,317
Property and equipment, net	869	812
Operating lease right-of-use assets	10,748	8,692
Total assets	351,281	370,821
Current liabilities:
Accounts payable	2,057	963
Accrued expenses	7,879	7,530
Operating lease liability, current	4,785	3,229
Amount due to related party	779	572
Total current liabilities	15,500	12,294
Operating lease liability, long term	5,412	5,463
Total liabilities	20,912	17,757
Stockholders’ equity:
Preferred stock, $0.0001 par value: 10,000,000 shares authorized at March 31, 2021 and December 31, 2020, respectively; 0 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively
Common stock, $0.0001 par value: 150,000,000 shares authorized at March 31, 2021 and December 31, 2020, respectively; 65,106,873 shares issued at March 31, 2021 and December 31, 2020, respectively; and 62,451,094 and 61,931,255 shares outstanding at March 31, 2021 and December 31, 2020, respectively	7	7
Additional paid-in capital	486,375	478,272
Accumulated other comprehensive income (loss)	13	(112)
Accumulated deficit	(156,026)	(125,103)
Total stockholders’ equity	330,369	353,064
Total liabilities and stockholders’ equity	$ 351,281	$ 370,821