Termination Costs - Additional Information (Details) - USD ($)				3 Months Ended	6 Months Ended
	Jun. 30, 2018	May 02, 2018	Apr. 02, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost And Reserve [Line Items]
Stock compensation expense					$ 2,127,858	$ 249,888
Mr. Charles Myers
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash		$ 484,000
Unvested options shares		282,994
Number of monthly premiums for disability insurance		12 months
Remaining amount payable	$ 28,038			$ 28,038	28,038
Mr. Charles Myers | Other Employment Benefits
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash		$ 20,000
Mr. Charles Myers | Disability Insurance Plan
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash		$ 3,200
Mr. Selbo
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash			$ 150,000
Remaining amount payable	0			0	$ 0
Sales and Marketing Expense
Restructuring Cost And Reserve [Line Items]
Agreement termination costs	$ 1,300,000
Sales and Marketing Expense | Mr. Selbo
Restructuring Cost And Reserve [Line Items]
Stock compensation expense			$ 44,267
General and Administrative Expense | Mr. Charles Myers
Restructuring Cost And Reserve [Line Items]
Stock compensation expense				$ 1,200,000