Subsequent Event (Details)	Mar. 11, 2019 USD ($)	Jan. 25, 2019 USD ($)	Apr. 30, 2019 USD ($)	Apr. 25, 2019 $ / shares	Apr. 04, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 13, 2019 USD ($)	Feb. 28, 2019 USD ($) $ / shares shares	Feb. 14, 2019 USD ($) $ / shares	Jan. 31, 2019 USD ($) $ / shares	Jan. 04, 2019 USD ($)	Dec. 31, 2018 $ / shares	Sep. 30, 2018 $ / shares	Apr. 16, 2018 $ / shares shares
Subsequent Event [Line Items]
Common stock, par value (usd per share) | $ / shares												$ 0.01	$ 0.01	$ 2.15
Number of securities called by warrants or rights (in shares) | shares														232,558
Exercise price of warrant (in usd per share) | $ / shares														$ 2.50
Subsequent Event
Subsequent Event [Line Items]
Number of securities called by warrants or rights (in shares) | shares								728,155
Exercise price of warrant (in usd per share) | $ / shares				$ 1.18				$ 1.18
Promissory Note | Secured Debt | Subsequent Event
Subsequent Event [Line Items]
Debt instrument, interest rate, percentage									9.25%	9.25%	9.25%
Face amount of debt									$ 1,000,000	$ 1,000,000	$ 1,000,000
Common stock, par value (usd per share) | $ / shares									$ 1.30	$ 1.30
Senior Secured Promissory Notes | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Face amount of debt		$ 5,000,000
Monthly installment amount		100,000
Minimum qualifying revenue	$ 13,000,000	$ 13,000,000
Maximum subsidiary indebtedness	$ 1,000,000
Initial Notes | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Face amount of debt								$ 3,000,000
Additional Notes, Tranche One | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Face amount of debt							$ 1,000,000	$ 1,000,000
Additional Notes, Tranche Two | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Face amount of debt					$ 1,000,000
Senior Secured Promissory Notes, Tranche One | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Face amount of debt						$ 1,000,000
Senior Secured Promissory Notes, Tranche Two | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Face amount of debt			$ 1,000,000
Prime Rate | Senior Secured Promissory Notes | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate		4.00%
January and March | Senior Secured Promissory Notes | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Minimum coverage ratio		0.7
February and May | Senior Secured Promissory Notes | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Minimum coverage ratio		0.9
December through May | Senior Secured Promissory Notes | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Minimum coverage ratio	0.7
June through November | Senior Secured Promissory Notes | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Minimum coverage ratio	0.9
JAPAN | Senior Secured Promissory Notes | Subordinated note payable | Subsequent Event
Subsequent Event [Line Items]
Maximum subsidiary indebtedness	$ 1,000,000