Schedule I - Valuation and Qualifying Accounts (Details) - USD ($)	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of fiscal year	$ 18,000	$ 27,000
Additions charged to expenses/revenues	66,000	21,000
Written off, less recoveries	(57,000)	(14,000)
Effects of foreign currency fluctuations	0	0
Balance at end of fiscal year	27,000	34,000
Allowance for Sales Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of fiscal year	15,000	41,000
Additions charged to expenses/revenues	26,000	9,000
Written off, less recoveries	0	(1,000)
Effects of foreign currency fluctuations	0	0
Balance at end of fiscal year	$ 41,000	$ 49,000