Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net loss	$ (47,583,455)	$ (53,135,859)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	3,376,305	2,195,075
Depreciation and amortization	2,567,742	1,543,667
Non-cash lease expense	225,537
Loss on disposal of property and equipment	6,587
Amortization of discount and debt issuance costs on long-term debt and convertible notes	75,364	17,550,541
Non-cash interest expense		343,103
Non-cash gain on early extinguishment of long-term debt		(137,695)
Warrant fair value adjustment		(277,715)
Non-cash rent (income) expense		(206,498)
Changes in operating assets and liabilities:
Accounts receivable – trade and other	272,557	1,349,622
Prepaid expenses and other current assets	(371,194)	(67,154)
Other non-current assets	807,192	2,408,097
Accounts payable	294,514	(1,281,784)
Accrued expenses	(108,707)	(1,055,564)
Accrued compensation	649,168	563,013
Operating lease liabilities	(422,364)
Deferred revenue	(8,071,920)	(1,621,384)
Net cash used in operating activities	(48,282,674)	(31,830,535)
Investing activities
Purchases of property, plant and equipment	(1,850,099)	(870,943)
Net cash used in investing activities	(1,850,099)	(870,943)
Financing activities
Principal payments on finance leases	(998,687)	(608,154)
Payments for finance lease deposits	(34,649)
Proceeds from issuance of long-term debt	5,000,000	11,000,000
Refund of principal payments on long-term debt		588,889
Principal payments on long-term debt		(12,406,010)
Payments for debt issuance costs		(397,000)
Proceeds from issuance of Series D preferred stock, net of issuance costs		25,106,896
Proceeds from sale of common stock, net of underwriting fees and commissions	63,039,490	47,320,233
Payments for offering costs	(754,028)	(2,122,903)
Proceeds from exercise of stock options and warrants	142,040	335,533
Net cash provided by financing activities	66,394,166	68,817,484
Net increase in cash	16,261,393	36,116,006
Cash, beginning of period	39,534,985	3,418,979
Cash, end of period	55,796,378	39,534,985
Supplemental disclosure of cash flow information
Cash paid for interest	887,038	1,094,532
Cash paid for operating lease liabilities	1,081,582
Right of use assets obtained with finance lease liabilities	834,693
Purchase of equipment with leases		456,517
Changes in purchases of property and equipment in accounts payable and accrued expenses	184,424	25,934
Purchase of build-to-suit asset with deferred financing obligation		272,656
Reclassification of deferred financing obligation to long-term debt		277,009
Reclassification of financing costs on deferred financing obligation to discount on long-term debt		1,614,466
Recording of discount on long-term debt		168,174
Leasehold improvements paid by landlord	936,104
Conversion of accrued interest to long-term debt		144,993
Conversion of convertible notes and accrued interest into Series D preferred stock		28,877,498
Deferred offering costs and commissions incurred but not paid	1,358,378	108,694
Exercise of stock options through exchange of vested stock options		$ 162,156