Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017		Dec. 31, 2016		Mar. 31, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Accrued warranty, current, see Note 1			$ 93
Accrued taxes, net	1,674		1,606
Accrued sales returns		[1]	1,975	[1]	$ 2,185	$ 4,179
Other accrued liabilities	3,601		4,417
Total other accrued liabilities	$ 5,275		$ 8,091

[1] The activity in the accrued sales returns liability account was as follows: