Stock Based Compensation - Stock Compensation Expense, Restricted Stock Units (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	$ 0	$ 2
Restricted Stock | General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	2
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	6	0
RSUs | Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	0
RSUs | Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	0
RSUs | Selling and Marketing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	0
RSUs | General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	6	0
Series D Preferred Stock | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	26	0
Series D Preferred Stock | Restricted Stock | Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	14	0
Series D Preferred Stock | Restricted Stock | Selling and Marketing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	4	0
Series D Preferred Stock | Restricted Stock | General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	$ 8	$ 0