Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 95,153	$ 34,012
Short-term investments	47,286	127,159
Prepaid expenses and other current assets	2,946	3,829
Total current assets	145,385	165,000
Property and equipment, net	61	73
In-process R&D	10,379	11,274
Other non-current assets	952	251
Total assets	156,777	176,598
Current liabilities:
Accounts payable	805	1,443
Accrued expenses and other current liabilities	2,901	4,884
Current portion of long-term debt		8,333
Total current liabilities	3,706	14,660
Long-term liabilities:
Long-term debt	25,942	17,323
Other long-term liabilities	87	117
Total liabilities	29,735	32,100
Commitments and Contingencies (Note 9)
Stockholders’ equity:
Common stock, $0.001 par value, 300,000,000 authorized as of June 30, 2022 and December 31, 2021; 114,041,271 and 114,036,892 shares issued and outstanding as of June 30, 2022 and December 31, 2021, respectively	116	116
Additional paid-in capital	445,927	444,898
Accumulated other comprehensive (loss) income	(1,016)	5
Accumulated deficit	(317,985)	(300,521)
Total stockholders’ equity	127,042	144,498
Total liabilities and stockholders’ equity	$ 156,777	$ 176,598