Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Restricted cash included in prepaid expenses and other current assets	$ 50,068	$ 50,068
Restricted cash included in other non-current assets	150,000
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	21,000,352	63,583,717	$ 14,925,820
ASU 2016-18
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	20,800,000	63,533,000
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	21,000,000	63,583,000
ASU 2016-18 | Prepaid Expenses and Other Current Assets
Summary Of Significant Accounting Policies [Line Items]
Restricted cash included in prepaid expenses and other current assets	50,000	$ 50,000
ASU 2016-18 | Other Non-Current Assets
Summary Of Significant Accounting Policies [Line Items]
Restricted cash included in other non-current assets	$ 150,000