Debt - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended	30 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2021	Mar. 31, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Credit line borrowings	$ 1,323		$ 1,323			$ 2,219
Proceeds from issuance of subordinated convertible promissory notes			1,700
Interest rate on convertible notes		5.00%
Conversion rate (in dollars per share)					$ 0.67
Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit line borrowings	1,300		1,300
Unamortized debt issuance costs	100		$ 100
Credit facility, interest rate			7.25%
Available borrowing capacity remaining	1,200		$ 1,200
Line Of Credit Facility, Increase In Borrowing Capacity, Amount	$ 500
Line Of Credit Facility, Increase In Borrowing Capacity, Required Percent Of Net Realizable Value Of Eligible Inventory	50.00%
Line Of Credit Facility, Increase In Borrowing Capacity, Required Amount Eligible Inventory	$ 1,000
Payments of Debt Issuance Costs	5
Subsequent Event
Line of Credit Facility [Line Items]
Interest rate on convertible notes				10.00%
Convertible Debt
Line of Credit Facility [Line Items]
Unamortized debt issuance costs	$ 54		$ 54