Goodwill and Other Intangible Assets - Carrying Values of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill, beginning balance			$ 31,152
Impairment Charge (HyperSound)	$ 31,200	$ 49,800	31,152
Goodwill, ending balance		$ 31,152	$ 0