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Restructuring - Narrative (Details) $ in Thousands		3 Months Ended
Restructuring - Narrative (Details) $ in Thousands	Mar. 29, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) position	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated \| position			3
Restructuring			$ 134	$ (50)
Cash and cash equivalents			3,861	$ 10,172	$ 6,335	$ 10,761
Short-term debt			3,400
Credit line borrowings			1,757		$ 2,219
Proceeds from issuance of subordinated convertible promissory notes	$ 1,700
Severance and Related Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring			100
Revolving Credit Facility
Restructuring Cost and Reserve [Line Items]
Credit line borrowings			$ 1,700
Scenario, Forecast \| Severance and Related Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring		$ 100