Income Taxes - Tax benefit (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Taxes
Net loss and comprehensive loss	$ (32,146,057)	$ (21,968,614)
Net loss before income tax	$ (32,146,057)	(35,149,856)
Deferred:
Federal		(12,165,311)
State		(1,015,931)
Total deferred		(13,181,242)
Total provision for income taxes		$ (13,181,242)
Effective tax rate, differed from the federal statutory rate
Statutory rate (as a percent)	(21.00%)	(34.00%)
State taxes (as a percent)	(5.60%)	(2.20%)
Tax credits (as a percent)	(0.20%)	(0.20%)
Goodwill and Indefinite-lived Intangible Asset Impairment (as a percent)	3.40%	16.30%
Other (as a percent)	1.00%	3.60%
Effect of U.S. tax law change (as a percent)	0.00%	2.60%
Valuation allowance (as a percent)	22.40%	(23.60%)
Effective tax rate (as a percent)		(37.50%)
Non-current deferred tax assets:
Net operating losses	$ 12,156,279	$ 5,827,970
Tax credits	329,563	325,188
Stock compensation	1,479,325	1,198,657
Other	(573,441)	(312,949)
Gross non-current deferred tax assets	14,538,608	7,664,764
Valuation allowance	(8,512,820)	(1,625,782)
Net non-current deferred tax assets	6,025,788	6,038,982
Non-current deferred tax liabilities:
Fixed assets and intangibles	6,025,788	6,038,982
Net non-current deferred tax liability	6,025,788	$ 6,038,982
Increase in valuation allowance	6,887,038
Re-measurement of net deferred tax assets and deferred tax liabilities	914,534
corresponding change in valuation allowance	$ 914,534