Debt - Credit agreement (Details) - Credit agreement - USD ($) $ / shares in Units, $ in Thousands	Apr. 24, 2020	Mar. 25, 2020	Apr. 15, 2020
Subsequent Event [Line Items]
Agreement amount		$ 3,500
Amount received		2,500
Additional borrowing amount		$ 1,000
Closing period		30 days
Threshold period to draw additional amount		5 months
Maximum amount per draw		$ 500
Credit facility matures		6 months
Credit facility bears interest		2.50%
Series G Warrants
Subsequent Event [Line Items]
Warrants purchased		1,200,000
Warrants issued		1,200,000
Subsequent Event
Subsequent Event [Line Items]
Amount received	$ 1,000
Warrants purchased			5,085,834
Warrant exercise price (in dollars per share)			$ 0.12