Debt (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Preferred stock, par value (in dollars per share)	$ 0.00001		$ 0.00001
Proceeds from issuance of redeemable convertible preferred stock	$ 4,194	$ 0
Transaction fees paid related to loan	$ 223	$ 867
Preferred stock, shares outstanding (in shares)	150.33		105.33
Average interest rate	2.00%
Promissory notes	$ 736		$ 993
Related party loan	$ 413		$ 420
Related party transaction, rate	8.00%
Artilium PLC | Share Holder
Debt Instrument [Line Items]
Equity method investment, ownership percentage	15.00%
Eight Percent Series C Redeemable Preferred Stock
Debt Instrument [Line Items]
Stock issued during period, shares, new issues (in shares)	45
Preferred stock, par value (in dollars per share)	$ 4,500,000
Proceeds from issuance of redeemable convertible preferred stock	$ 4,200
Net proceeds from issuance of redeemable convertible preferred stock	4,000
Transaction fees paid related to loan	$ 200
Preferred stock, dividend rate, percentage	8.00%
Preferred stock, premium	12.50%
Preferred stock, shares outstanding (in shares)	150.33		105.33
Bank Notes | Minimum
Debt Instrument [Line Items]
Loan term	6 months
Bank Notes | Maximum
Debt Instrument [Line Items]
Loan term	24 months