Fair Value of Financial Instruments - Contingent Consideration (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended	12 Months Ended
	Oct. 01, 2015	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018	Sep. 30, 2017	Jul. 31, 2017
Deltenna
Assets and liabilities measured at fair value on a recurring basis
Contingent consideration						$ 1,300
Volatility earning metrics				48.00%	40.00%
Deltenna | Maximum
Assets and liabilities measured at fair value on a recurring basis
Contingent consideration		$ 7,600		$ 7,600		$ 7,600
TeraLogics
Assets and liabilities measured at fair value on a recurring basis
Volatility earning metrics				20.00%	15.00%
H4 Global
Assets and liabilities measured at fair value on a recurring basis
Period for contingent consideration contracts	5 years
H4 Global | Maximum
Assets and liabilities measured at fair value on a recurring basis
Contingent consideration		3,500		$ 3,500
Revenue Targets | TeraLogics | Maximum
Assets and liabilities measured at fair value on a recurring basis
Contingent consideration		1,800		1,800
Contract extensions | TeraLogics | Maximum
Assets and liabilities measured at fair value on a recurring basis
Contingent consideration		1,000		1,000
Level 3
Change in fair value of our Level 3 contingent consideration
Balance at the Beginning period		3,765	$ 5,217	5,217
Cash paid to seller			(1,750)
Total remeasurement (gain) loss recognized in earnings		154	298
Balance at the ending period		3,919	3,765	3,919	$ 5,217
Level 3 | Deltenna
Change in fair value of our Level 3 contingent consideration
Balance at the Beginning period		1,361	1,376	1,376
Total remeasurement (gain) loss recognized in earnings		(168)	(15)
Balance at the ending period		1,193	1,361	1,193	1,376
Level 3 | H4 Global
Change in fair value of our Level 3 contingent consideration
Balance at the Beginning period		704	591	591
Total remeasurement (gain) loss recognized in earnings		222	113
Balance at the ending period		926	704	926	591
Level 3 | Revenue Targets | TeraLogics
Change in fair value of our Level 3 contingent consideration
Balance at the Beginning period		800	2,450	2,450
Cash paid to seller			(1,750)
Total remeasurement (gain) loss recognized in earnings		100	100
Balance at the ending period		900	800	900	2,450
Level 3 | Contract extensions | TeraLogics
Change in fair value of our Level 3 contingent consideration
Balance at the Beginning period		900	800	800
Total remeasurement (gain) loss recognized in earnings			100
Balance at the ending period		$ 900	$ 900	$ 900	$ 800