CONDENSED BALANCE SHEETS - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 27,754,813	$ 10,195,292
Accounts receivable and unbilled receivable	109,334	203,480
Prepaid expenses and other current assets	954,986	954,957
Total current assets	28,819,133	11,353,729
Property and equipment, net	655,367	877,823
Operating lease right-of-use assets	501,894	697,418
Other assets	152,585	157,576
Total Assets	30,128,979	13,086,546
Current liabilities:
Accounts payable	1,155,531	656,304
Accrued expenses	2,858,161	3,260,061
Note payable	70,730	0
Operating lease liabilities	877,607	865,379
Total current liabilities	4,962,029	4,781,744
Derivative financial instruments—warrants	46,164	4,127
Note payable, net of current portion	234,270	0
Operating lease liabilities, net of current portion	429,776	860,963
Other liabilities	72,701	128,368
Total Liabilities	5,744,940	5,775,202
Commitments and contingencies (Note 8)
Stockholders’ equity
Preferred stock, 20,000,000 shares authorized; (Note 7)	926	60
Common stock, $0.0001 par value, 150,000,000 shares authorized; 21,325,076 and 8,593,633 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	9,585	8,312
Additional paid-in capital	247,528,273	217,172,528
Service receivables	(2,765,164)	(971,673)
Accumulated deficit	(220,389,581)	(208,897,883)
Total stockholders’ equity	24,384,039	7,311,344
Total liabilities and stockholders’ equity	$ 30,128,979	$ 13,086,546