CONDENSED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 59,441	$ 74,025
Other receivables	896	1,233
Prepaid expenses and other assets	12,204	3,565
Total current assets	72,541	78,823
Property and equipment, net	2,637	1,924
Operating lease right-of-use assets	1,648	1,715
Other assets	32	32
Total assets	76,858	82,494
Current liabilities:
Current portion of long-term debt	3,686	2,378
Accounts payable	1,918	2,921
Accrued expenses and other current liabilities	1,891	3,180
Total current liabilities	7,495	8,479
Long-term debt, net	11,058	12,326
Operating lease liabilities, net	1,438	1,508
Development derivative liability	3,086	0
Other long-term liabilities	295	203
Total liabilities	23,372	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 March 31, 2020 and December 31, 2019	0	0
Common stock, $0.001 par value; 200,000,000 shares authorized; 28,810,607 shares issued and 28,780,640 shares outstanding at March 31, 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 March 31, 2020 and December 31, 2019	(24)	(24)
Additional paid-in capital	230,544	222,131
Accumulated deficit	(177,063)	(162,158)
Total stockholders’ equity	53,486	59,978
Total liabilities and stockholders' equity	$ 76,858	$ 82,494