CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 53,025	$ 74,025
Other receivables	0	1,233
Prepaid expenses and other assets	10,716	3,565
Total current assets	63,741	78,823
Property and equipment, net	4,876	1,924
Operating lease right-of-use assets	2,136	1,715
Other assets	57	32
Total assets	70,810	82,494
Current liabilities:
Current portion of long-term debt	5,015	2,378
Accounts payable	6,967	2,921
Accrued expenses and other current liabilities	5,820	3,180
Total current liabilities	17,802	8,479
Long-term debt, net	9,768	12,326
Operating lease liabilities, net	1,773	1,508
Development derivative liability	14,686	0
Other long-term liabilities	388	203
Total liabilities	44,417	22,516
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized; zero shares issued and outstanding at June 30, 2020 and December 31, 2019	0	0
Common stock, $0.001 par value; 200,000,000 shares authorized; 28,891,534 shares issued and 28,861,567 shares outstanding at June 30, 2020; 28,796,371 shares issued and 28,766,404 shares outstanding at December 31, 2019	29	29
Treasury stock, at cost, 29,967 shares as of June 30, 2020 and December 31, 2019	(24)	(24)
Additional paid-in capital	231,593	222,131
Accumulated deficit	(205,205)	(162,158)
Total stockholders’ equity	26,393	59,978
Total liabilities and stockholders' equity	$ 70,810	$ 82,494