Income Taxes - Reconciliation of Income tax expense (benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Computed “expected” tax benefit (in Dollars)	$ (93)		$ (269)
Computed “expected” tax benefit (benefit)	21.00%	21.00%	24.30%	35.00%
Increases (reductions) in taxes resulting from:
State income taxes, net of federal tax benefit (in Dollars)	$ (73)		$ (107)
State income taxes, net of federal tax benefit	16.50%		9.70%
Foreign operations (in Dollars)	$ (46)		$ (70)
Foreign operations	10.40%		6.30%
Permanent differences (in Dollars)	$ 31		$ (14)
Permanent differences	(7.00%)		1.30%
Change in valuation allowance (in Dollars)	$ 235		$ 118
Change in valuation allowance	(53.20%)		(10.70%)
Deferred revenue (in Dollars)	$ (48)
Deferred revenue	10.90%
Impact of 965 one-time transition tax (in Dollars)			$ 771
Impact of 965 one-time transition tax			(69.70%)
Federal tax rate change (in Dollars)			$ 588
Federal tax rate change			(53.20%)
Payable true up (in Dollars)	$ 17
Payable true up	(3.80%)
Uncertain tax liability adjustment (in Dollars)	$ (41)		$ 11
Uncertain tax liability adjustment	9.30%		(1.00%)
Research & development credit (in Dollars)	$ (90)		$ (125)
Research & development credit	20.40%		11.30%
Other items (in Dollars)	$ 37		$ (21)
Other items	(8.40%)		2.00%
Income tax (benefit) expense (in Dollars)	$ (71)		$ 882
Income tax (benefit) expense	16.10%		(79.70%)