Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Revenue	$ 13,823	$ 35,065	$ 89,561	$ 129,293
Cost of revenue	8,220	17,667	51,378	69,870
Gross profit	$ 5,603	$ 17,398	$ 38,183	$ 59,423
Gross margin (in percent)	41.00%	50.00%	43.00%	46.00%
Automotive
Segment Reporting Information [Line Items]
Revenue	$ 5,808	$ 25,476	$ 57,950	$ 94,487
Cost of revenue	4,616	14,112	36,917	56,095
Gross profit	$ 1,192	$ 11,364	$ 21,033	$ 38,392
Gross margin (in percent)	21.00%	45.00%	36.00%	41.00%
Advertising
Segment Reporting Information [Line Items]
Revenue	$ 4,811	$ 5,284	$ 21,168	$ 20,037
Cost of revenue	2,174	2,224	9,988	9,669
Gross profit	$ 2,637	$ 3,060	$ 11,180	$ 10,368
Gross margin (in percent)	55.00%	58.00%	53.00%	52.00%
Mobile Navigation
Segment Reporting Information [Line Items]
Revenue	$ 3,204	$ 4,305	$ 10,443	$ 14,769
Cost of revenue	1,430	1,331	4,473	4,106
Gross profit	$ 1,774	$ 2,974	$ 5,970	$ 10,663
Gross margin (in percent)	55.00%	69.00%	57.00%	72.00%