Consolidated Balance Sheets - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 174,102,382	$ 115,917,807
Restricted cash	34,174	34,174
Total cash, cash equivalents and restricted cash	174,136,556	115,951,981
Short-term investments	43,723,840	100,005,558
Accounts receivable	4,463,442	4,610,202
Tax refund receivable	6,887,981	7,762,793
Prepaid expenses and other current assets	9,413,070	1,926,675
Total current assets	238,624,889	230,257,209
Property and equipment, net	4,751,010	1,056,920
Intangible assets, net	12,956,112	12,823,846
Other assets	928,839	977,238
Total assets	257,260,850	245,115,213
Current liabilities:
Accounts payable	1,421,192	612,293
Accrued expenses and other current liabilities	7,674,536	11,408,154
Total current liabilities	9,095,728	12,020,447
Contingent consideration	5,270,000	5,390,000
Other long-term liabilities	1,617,150	1,828,443
Total liabilities	15,982,878	19,238,890
Commitments and contingencies (Note 16)
Stockholders' equity:
Common stock, $0.0001 par value; 200,000,000 shares authorized; 39,693,524 and 37,142,946 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively	3,956	3,697
Additional paid-in capital	482,083,670	417,337,742
Accumulated deficit	(235,771,414)	(186,420,599)
Accumulated other comprehensive loss, net	(5,038,240)	(5,044,517)
Total stockholders' equity	241,277,972	225,876,323
Total liabilities and stockholders' equity	$ 257,260,850	$ 245,115,213