Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 81,580	$ 77,833
Prepaid expenses and other current assets	2,979	3,176
Total current assets	84,559	81,009
Property and equipment, net	7,586	8,341
Right of use asset - operating lease	11,192
Other assets	1,500	1,570
Total assets	104,837	90,920
Current liabilities:
Accounts payable	2,729	620
Accrued expenses	8,823	8,758
Operating lease liability, current portion	1,607
Other current liabilities	389	365
Total current liabilities	13,548	9,743
Noncurrent liabilities:
Long-term debt	29,924	19,634
Operating lease liability, net of current portion	10,503
Deferred rent, net of current portion		1,148
Other noncurrent liabilities	432	198
Total liabilities	54,407	30,723
Commitments and contingencies
Stockholder’s equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued or outstanding as of September 30, 2020 and December 31, 2019, respectively	0	0
Common stock, $0.001 par value; 200,000,000 shares authorized; 46,220,859 and 32,232,258 shares issued and 46,184,087 and 32,170,605 shares outstanding as of September 30, 2020 and December 31, 2019, respectively	46	32
Additional paid-in capital	313,853	259,018
Accumulated deficit	(263,469)	(198,853)
Total stockholders’ equity	50,430	60,197
Total liabilities and stockholders’ equity	$ 104,837	$ 90,920