Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenues	$ 178,613,495	$ 123,753,813	$ 76,124,109
Operating costs and expenses:
Sales and marketing	32,085,512	20,355,964	15,089,987
Product development and content	102,757,432	60,704,473	25,790,173
General and administrative	21,093,834	19,549,805	9,494,804
Depreciation and amortization	13,775,881	11,573,827	4,069,211
Acquisition and restructuring	5,038,254	12,151,492	2,457,295
Goodwill impairment	0	56,428,861	0
Total operating costs and expenses	174,750,913	180,764,422	56,901,470
Income (loss) from operations	3,862,582	(57,010,609)	19,222,639
Other income (expense):
Interest income	24,417	5,731	21,185
Interest expense	(2,322,148)	(860,392)	(19,388)
Change in warrant liability	0	0	(864,596)
Loss on disposal of assets	(95,315)	0	0
Gain (loss) on foreign currency transactions	97,533	(32,488)	33,416
Other	43,775	9,631	0
Total other expense	(2,251,738)	(877,518)	(829,383)
Income (loss) before income tax benefit (expense)	1,610,844	(57,888,127)	18,393,256
Income tax benefit (expense)	(467,456)	(6,703,600)	27,875,362
Net income (loss)	$ 1,143,388	$ (64,591,727)	$ 46,268,618
Basic and diluted net income (loss) per common stockholder:
Basic net income (loss) per common stockholders (in dollars per share)	$ 0.02	$ (0.94)	$ 0.89
Diluted net income (loss) per common stockholders (in dollars per share)	$ 0.02	$ (0.94)	$ 0.80
Weighted average shares outstanding:
Basic (in shares)	73,085,542	68,743,956	51,963,702
Diluted (in shares)	75,616,439	68,743,956	57,745,652
Comprehensive income (loss):
Net income (loss)	$ 1,143,388	$ (64,591,727)	$ 46,268,618
Reclassification of gains (losses) on derivative financial instruments, net of tax benefit of $924,646, $548,063, $—	(2,059,623)	1,565,896	0
Unrealized gains (losses) on derivative financial instruments, net of tax expense of $999,425, $850,845, $—	2,087,389	(2,302,415)	0
Foreign currency translation adjustment	(936,895)	(388,019)	0
Other comprehensive income (loss)	(909,129)	(1,124,538)	0
Comprehensive income (loss)	$ 234,259	$ (65,716,265)	$ 46,268,618