Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss	$ (70,292,227)	$ (41,480,466)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of debt discount	15,149	17,963
Change in fair value of preferred unit warrant liability	0	193,779
Depreciation and amortization	1,561,557	706,000
Net accretion of bond discounts/premiums	154,022	248,069
Amortization of right to use assets	691,345	0
Non-cash share/unit-based compensation	20,072,710	11,630,300
Changes in operating assets and liabilities:
Other receivables	(4,024,862)	(1,215,514)
Account receivable	2,775,831	22,224,169
Prepaid expenses and other current assets	(1,065,005)	(2,501,383)
Accounts payable	1,608,735	2,002,163
Accrued expenses	3,601,628	455,340
Deferred liability	0	150,000
Operating lease liabilities	(581,961)	0
Deferred revenue	4,856,736	(8,548,090)
Net cash used in operating activities	(40,626,342)	(16,117,670)
Cash flows from investing activities:
Purchase of marketable securities	(256,548,355)	(234,894,225)
Maturities of marketable securities	169,695,816	58,059,526
Purchase of property, equipment and leasehold improvements	(6,244,024)	(2,830,661)
Net cash used in investing activities	(93,096,563)	(179,665,360)
Cash flows from financing activities:
Repayments of long-term debt	(169,610)	(173,889)
Proceeds from long-term debt	0	2,000,000
Proceeds from issuance of common stock	137,686,006	114,583,172
Payment of common stock offering costs	(597,131)	(3,423,589)
Proceeds from issuance of Series C redeemable convertible preferred units	0	55,000,001
Proceeds from exercise of warrant	0	75,000
Proceeds from exercise of stock options	2,824,641	0
Net cash provided by financing activities	139,743,906	168,060,695
Net increase (decrease) in cash and cash equivalents	6,021,001	(27,722,335)
Cash and cash equivalents, beginning of the period	3,190,056	30,912,391
Cash and cash equivalents, end of the period	9,211,057	3,190,056
Supplemental disclosure of cash flow information:
Purchases of property, equipment and leasehold improvements unpaid at period end	189,908	159,494
Cash paid for interest	70,420	39,476
Increase in redemption value of preferred units	$ 0	$ 198,366,756