CONDENSED BALANCE SHEETS - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 9,032,206	$ 11,453,133
Accounts receivable and unbilled receivable	152,038	167,755
Prepaid expenses	792,540	1,144,377
Total current assets	9,976,784	12,765,265
Property and equipment, net	271,401	1,304,433
Operating lease right-of-use assets	1,503,335	0
Other assets	170,943	102,798
Total Assets	11,922,463	14,172,496
Current liabilities:
Accounts payable	492,367	664,840
Accrued expenses	2,842,153	1,813,842
Operating lease liabilities	836,294	0
Deferred rent, current portion	0	486,636
Total current liabilities	4,170,814	2,965,318
Derivative financial instruments—warrants	4,956	32,315
Operating lease liabilities, net of current portion	1,090,713	0
Deferred rent, net of current portion	0	1,090,671
Total Liabilities	5,266,483	4,088,304
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 September 30, 2019 and December 31, 2018 with liquidation preference of $606,000 at September 30, 2019 and December 31, 2018; 200,000 designated as Series C Convertible Preferred Stock; 0 shares outstanding at September 30, 2019 and December 31, 2018	60	60
Common stock, $0.0001 par value, 150,000,000 shares authorized; 6,436,505 and 3,831,880 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	8,096	7,742
Additional paid-in capital	212,463,077	202,267,605
Service receivables	(1,165,966)	0
Accumulated deficit	(204,649,287)	(192,191,215)
Total stockholders’ equity	6,655,980	10,084,192
Total liabilities and stockholders’ equity	$ 11,922,463	$ 14,172,496