Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net and comprehensive loss	$ (21,400,606)	$ (16,983,511)
Adjustments to reconcile net and comprehensive loss to net cash used in operating activities:
Depreciation	51,268	69,673
Stock-based compensation	649,409	488,326
Amortization of debt issuance costs	75,561	188,686
Interest expense related to convertible note conversion	204,929	2,823
Changes in operating assets and liabilities:
Accounts receivable	4,157	114,359
Prepaid expenses and current other assets	(72,889)	90,404
Accounts payable and other current liabilities	1,604,636	311,096
Net cash used in operating activities	(18,883,535)	(15,718,144)
Investing activities:
Purchase of furniture and equipment	(8,896)	(113,297)
Proceeds from maturities of short-term investments	50,000
Net cash provided by (used in) investing activities	41,104	(113,297)
Financing activities:
Proceeds from exercise of stock options	36,100	18,968
Proceeds from issuances of convertible notes	297,354	12,542,203
Cash paid for debt issuance costs		(264,247)
Proceeds from sale of common stock	40,247,777
Cash paid in connection with the sale of common stock	(3,084,385)
Net cash provided by financing activities	37,496,846	12,296,924
Net increase (decrease) in cash and cash equivalents	18,654,415	(3,534,517)
Cash and cash equivalents at beginning of year	1,609,694	5,144,211
Cash and cash equivalents, twelve months ended	20,264,109	1,609,694
Non-cash financing activities
Conversion of redeemable convertible preferred stock into common stock	74,701,187
Conversion of convertible notes and accrued interest into common stock	13,447,934
Adjustment of redeemable convertible preferred stock to redemption value	$ 943,297	4,152,801
Extinguishment of redeemable convertible preferred stock		$ (224,224)