Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 7,850	$ 5,311
Investments	6,271	12,967
Prepaid expenses and other current assets	1,828	1,247
Restricted cash	25	25
Total current assets	15,974	19,550
Operating lease, right-of-use asset	5,550	6,060
Property and equipment, net	147	295
Restricted cash, non-current	568	568
Total assets	22,239	26,473
Current liabilities:
Accounts payable	1,002	1,452
Accrued expenses and other current liabilities	3,687	3,941
Paycheck Protection Program loan, current portion	48
Operating lease liability, current portion	512	446
Total current liabilities	5,249	5,839
Paycheck Protection Program loan, net of current portion	336
Operating lease liability, net of current portion	4,196	4,586
Total liabilities	9,781	10,425
Commitments and contingencies (Note 11)
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized and no shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively
Common stock, $0.001 par value; 150,000,000 shares authorized at September 30, 2020 and December 31, 2019; 39,874,847 and 27,810,358 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	40	28
Additional paid-in capital	226,715	214,148
Accumulated other comprehensive gain/(loss)	(1)	7
Accumulated deficit	(214,296)	(198,135)
Total stockholders’ equity	12,458	16,048
Total liabilities and stockholders’ equity	$ 22,239	$ 26,473