CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 64,456	$ 28,122
Receivable from sublicense	18,400	0
Prepaid expenses and other assets	5,644	12,027
Total current assets	88,500	40,149
Property and equipment, net	10,379	8,224
Operating lease right-of-use assets	1,701	1,927
Other assets	57	57
Total assets	100,637	50,357
Current liabilities:
Current portion of long-term debt	5,384	5,355
Current portion of deferred sublicense revenue	1,424	0
Accounts payable	2,958	3,674
Accrued expenses and other current liabilities	6,408	5,931
Total current liabilities	16,174	14,960
Long-term debt, net	4,073	6,773
Operating lease liabilities, net	1,306	1,548
Deferred sublicense revenue, net	8,238	0
Development derivative liability	89,329	51,719
Other long-term liabilities	692	559
Total liabilities	119,812	75,559
Commitments and contingencies (Note 9)
Stockholders’ deficit:
Preferred stock, $0.001 par value; 10,000,000 shares authorized; zero shares issued and outstanding at June 30, 2021 and December 31, 2020	0	0
Common stock, $0.001 par value; 200,000,000 shares authorized; 48,057,720 shares issued and 48,027,753 shares outstanding at June 30, 2021; 29,471,854 shares issued and 29,441,887 shares outstanding at December 31, 2020	48	29
Treasury stock, at cost, 29,967 shares as of June 30, 2021 and December 31, 2020	(24)	(24)
Additional paid-in capital	297,561	235,516
Accumulated deficit	(316,760)	(260,723)
Total stockholders’ deficit	(19,175)	(25,202)
Total liabilities and stockholders' deficit	$ 100,637	$ 50,357