Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 22,880	$ 49,804
Short-term investments	59,308	71,957
Prepaid expenses and other current assets	2,933	2,306
Total current assets	85,121	124,067
Property and equipment, net	156	352
In-process R&D	12,218	11,111
Other non-current assets	250	673
Total assets	97,745	136,203
Current liabilities:
Accounts payable	2,595	3,409
Accrued expenses and other current liabilities	5,579	5,471
Debt facility		2,000
Total current liabilities	8,174	10,880
Long-term liabilities:
Debt facility	25,104	23,112
Other long-term liabilities	84	513
Total liabilities	33,362	34,505
Stockholders’ equity:
Common stock, $0.001 par value, 200,000,000 shares authorized as of December 31, 2020 and 2019; 54,152,955 and 50,790,441 shares issued and outstanding as of December 31, 2020 and 2019, respectively	55	52
Additional paid-in capital	320,893	309,555
Accumulated other comprehensive income (loss)	942	(17)
Accumulated deficit	(257,507)	(207,892)
Total stockholders’ equity	64,383	101,698
Total liabilities and stockholders' equity	$ 97,745	$ 136,203