CONDENSED BALANCE SHEETS - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 9,277,025	$ 10,195,292
Accounts receivable and unbilled receivable	106,432	203,480
Prepaid expenses and other current assets	899,451	954,957
Total current assets	10,282,908	11,353,729
Property and equipment, net	758,503	877,823
Operating lease right-of-use assets	617,622	697,418
Other assets	156,370	157,576
Total Assets	11,815,403	13,086,546
Current liabilities:
Accounts payable	598,985	656,304
Accrued expenses	3,411,723	3,260,061
Operating lease liabilities	870,592	865,379
Total current liabilities	4,881,300	4,781,744
Derivative financial instruments—warrants	2,020	4,127
Operating lease liabilities, net of current portion	649,621	860,963
Other liabilities	139,044	128,368
Total Liabilities	5,671,985	5,775,202
Commitments and contingencies (Note 8)
Stockholders’ equity
Preferred stock, $0.001 par value, 20,000,000 shares authorized; 277,100 designated as Series A Convertible Preferred Stock; 60,600 shares outstanding at March 31, 2020 and December 31, 2019 with liquidation preference of $606,000 at March 31, 2020 and December 31, 2019; 200,000 designated as Series C Convertible Preferred Stock; 0 shares outstanding at March 31, 2020 and December 31, 2019	60	60
Common stock, $0.0001 par value, 150,000,000 shares authorized; 11,010,587 and 8,593,633 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	8,554	8,312
Additional paid-in capital	219,805,965	217,172,528
Service receivables	(678,656)	(971,673)
Accumulated deficit	(212,992,505)	(208,897,883)
Total stockholders’ equity	6,143,418	7,311,344
Total liabilities and stockholders’ equity	$ 11,815,403	$ 13,086,546