Payment Obligation in Connection with Hirsch Acquisition (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
2019 (remaining six months)	$ 12,251
2020	1,295
Total	13,546
Less: Current portion - payment obligation	(1,122)	$ (1,025)
Long-term payment obligation	1,216	$ 1,860
Hirsch Electronics
Related Party Transaction [Line Items]
2019 (remaining six months)	638
2020	1,408
2021	363
Present value discount factor	(71)
Total	2,338
Less: Current portion - payment obligation	(1,122)
Long-term payment obligation	$ 1,216