Consolidated Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 23,432,000	$ 44,290,000
Marketable securities	25,298,000	15,120,000
Accounts receivable	605,000	755,000
Prepaid expenses and other current assets	1,855,000	860,000
Total current assets	51,190,000	61,025,000
Property and equipment, net	1,794,000	1,847,000
Operating lease right-of-use	4,339,000	5,337,000
Deposits	2,572,000	2,572,000
Restricted cash, long term	150,000	150,000
Other long term assets	604,000	674,000
Total assets	60,649,000	71,605,000
Current liabilities:
Accounts payable	1,740,000	883,000
Accrued expenses	1,144,000	2,227,000
Research and development contract liability, current portion	4,691,000	4,097,000
Operating lease liability, current portion	4,515,000	4,448,000
Total current liabilities	12,090,000	11,655,000
Research and development contract liability, net of current portion	3,129,000	4,018,000
Operating lease liability, net of current portion	194,000	1,348,000
Total liabilities	15,413,000	17,021,000
Stockholders’ equity:
Preferred Stock, $0.001 par value; 10,000,000 shares authorized and 0 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively
Common stock, $0.001 par value; 50,000,000 shares authorized; 26,575,959 and 26,562,178 shares issued and outstanding, at March 31, 2020 and December 31, 2019, respectively	27,000	26,000
Additional paid in capital	166,278,000	163,068,000
Accumulated other comprehensive income/ (loss)	249,000	(10,000)
Accumulated deficit	(121,318,000)	(108,500,000)
Total stockholders’ equity	45,236,000	54,584,000
Total liabilities and stockholders’ equity	$ 60,649,000	$ 71,605,000