CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 55,776	$ 62,294
Short-term investments	201,648	230,165
Prepaid expenses and other current assets	10,436	9,945
Total current assets	267,860	302,404
Property and equipment, net	3,504	3,671
Right-of-use asset	1,989	2,045
Restricted cash	403	403
Total assets	273,756	308,523
Current liabilities:
Accounts payable	5,932	10,415
Accrued expenses and other current liabilities	11,277	13,530
Lease liability	487	472
Total current liabilities	17,696	24,417
Long-term liabilities:
Deferred rent	2,959	3,086
Total liabilities	20,655	27,503
Commitments and contingencies
Stockholders’ equity:
Preferred Stock, $0.001 par value: 10,000,000 shares authorized; no shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively
Common stock, $0.001 par value: 120,000,000 shares authorized; 44,088,390 and 43,996,753 shares issued and outstanding March 31, 2020 and December 31, 2019, respectively	44	44
Additional paid-in capital	612,552	606,307
Accumulated deficit	(359,495)	(325,331)
Total stockholders’ equity	253,101	281,020
Total liabilities and stockholders’ equity	$ 273,756	$ 308,523