CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues	$ 52,000,104	$ 42,801,745	$ 101,513,341	$ 80,439,538
Operating costs and expenses:
Sales and marketing	9,059,530	7,753,486	16,900,396	14,801,479
Product development and content	30,149,797	24,411,288	61,273,172	46,512,825
General and administrative	5,892,437	5,154,103	10,820,219	10,623,281
Depreciation and amortization	3,430,018	3,505,180	6,628,122	7,134,783
Acquisition and restructuring	25,454	1,036,602	504,449	4,386,553
Total operating costs and expenses	48,557,236	41,860,659	96,126,358	83,458,921
Income (loss) from operations	3,442,868	941,086	5,386,983	(3,019,383)
Other income (expense):
Interest income	27,605	2,742	59,994	9,950
Interest expense	(328,196)	(671,294)	(731,060)	(1,278,980)
Gain (loss) on foreign currency transactions	(2,380)	4,216	(67,589)	107,259
Other	(787)	28,571	2,762	21,627
Total other expense	(303,758)	(635,765)	(735,893)	(1,140,144)
Income (loss) before income tax expense	3,139,110	305,321	4,651,090	(4,159,527)
Income tax expense	(935,284)	(540,593)	(1,189,665)	(288,406)
Net income (loss)	$ 2,203,826	$ (235,272)	$ 3,461,425	$ (4,447,933)
Basic and diluted net income (loss) per common stockholder:
Basic net income (loss) per common stockholder (in dollars per share)	$ 0.03	$ 0.00	$ 0.05	$ (0.06)
Diluted net income (loss) per common stockholder (in dollars per share)	$ 0.03	$ 0.00	$ 0.04	$ (0.06)
Weighted average shares outstanding:
Basic (in shares)	75,648,621	72,753,487	75,250,562	72,369,619
Diluted (in shares)	78,508,559	72,753,487	78,656,115	72,369,619
Comprehensive income (loss):
Net income (loss)	$ 2,203,826	$ (235,272)	$ 3,461,425	$ (4,447,933)
Other comprehensive income (loss):
Reclassification of (gains) losses on derivative financial instruments, net of tax of $106,221, $832,995, $240,254 and $508,691, respectively	232,239	(1,831,921)	(543,598)	(1,053,778)
Unrealized gains (losses) on derivative financial instruments, net of tax of $50,362, $834,099, $335,560 and $416,203, respectively	(131,905)	1,858,182	695,763	1,097,056
Foreign currency translation adjustment	263,173	(952,438)	(57,625)	(584,085)
Other comprehensive income (loss)	363,507	(926,177)	94,540	(540,807)
Comprehensive income (loss)	$ 2,567,333	$ (1,161,449)	$ 3,555,965	$ (4,988,740)