CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 90,332	$ 52,000	$ 145,398	$ 101,513
Operating costs and expenses:
Sales and marketing	8,089	9,060	15,803	16,900
Product development and content	57,627	30,151	95,298	61,273
General and administrative	6,663	5,892	11,693	10,820
Depreciation and amortization	2,689	3,430	5,509	6,628
Acquisition, restructuring and other	1,335	25	4,705	504
Total operating costs and expenses	76,403	48,558	133,008	96,125
Income from operations	13,929	3,442	12,390	5,388
Other income (expense):
Interest income	7	28	20	60
Interest expense	(554)	(328)	(950)	(731)
Gain (loss) on foreign currency transactions	3	(2)	(4)	(68)
Loss on disposal of assets	0	0	(108)	0
Other items of (expense) income, net	0	(1)	2	3
Total other expense	(544)	(303)	(1,040)	(736)
Income before income tax expense	13,385	3,139	11,350	4,652
Income tax expense	(3,006)	(935)	(3,379)	(1,190)
Net income	$ 10,379	$ 2,204	$ 7,971	$ 3,462
Basic and diluted net income per share:
Basic net income per share (in dollars per share)	$ 0.14	$ 0.03	$ 0.11	$ 0.05
Diluted net income per share (in dollars per share)	$ 0.14	$ 0.03	$ 0.10	$ 0.04
Weighted-average shares outstanding:
Basic (in shares)	72,030,143	75,648,621	71,516,532	75,250,562
Diluted (in shares)	76,225,180	78,508,559	76,073,893	78,656,115
Comprehensive income:
Net income	$ 10,379	$ 2,204	$ 7,971	$ 3,462
Other comprehensive income:
Reclassification of loss (gain) on derivatives, net of tax of $227, $106, $46 and $240, respectively	813	232	216	(544)
Unrealized (loss) gain on derivatives, net of tax of $183, $50, $272 and $336, respectively	(401)	(131)	421	697
Foreign currency translation adjustment	436	263	29	(58)
Other comprehensive income	848	364	666	95
Comprehensive income	$ 11,227	$ 2,568	$ 8,637	$ 3,557