Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 33,718,713	$ 8,769,465
Restricted cash	634,416	3,534,174
Total cash, cash equivalents, and restricted cash	34,353,129	12,303,639
Accounts receivable	3,461,938	3,806,239
Tax refunds receivable	1,008,973	6,361,657
Prepaid expenses and other current assets	548,094	994,332
Total current assets	39,372,134	23,465,867
Property and equipment, net	1,342,802	603,146
Intangible assets, net	13,851,924	38,722,270
Other assets	183,682	238,917
Total assets	54,750,542	63,030,200
Current liabilities:
Notes payable	71,596	49,702
Accounts payable	372,860	129,075
Accrued expenses and other current liabilities	4,082,949	3,660,924
Total current liabilities	4,527,405	3,839,701
Deferred income taxes	58,500	5,938,402
Other long-term liabilities	1,852,071	4,574,507
Total liabilities	6,437,976	14,352,610
Commitments and contingencies (Note 15)
Stockholders’ equity:
Common stock, $0.0001 par value; 200,000,000 and 100,000,000 shares authorized; 9,078,735 and 609,280 shares issued; 9,078,238 and 608,499 shares outstanding at December 31, 2018 and 2017, respectively	876	61
Additional paid-in capital	170,207,844	121,657,587
Accumulated deficit	(116,855,991)	(77,684,839)
Accumulated other comprehensive loss — foreign currency translation adjustments	(5,040,163)	(4,576,986)
Total stockholders’ equity	48,312,566	39,395,823
Total liabilities and stockholders’ equity	$ 54,750,542	63,030,200
Series B Redeemable Convertible Preferred Stock [Member]
Current liabilities:
Series B redeemable convertible preferred stock; $0.0001 par value; 16,000 shares designated; zero and 12,177 shares issued and outstanding at December 31, 2018 and 2017, respectively; aggregate liquidation and redemption value of $9,281,767 at December 31, 2017		$ 9,281,767