Stock Based Compensation - Stock Compensation Expense, Restricted Stock Units (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	$ 0	$ 14	$ 6	$ 64
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	2	0	10
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	2	0	11
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	0	0	0
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	10	6	43
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	0	0	3
Restricted stock | General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	0	0	3
Series D Preferred Stock | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	28	0	83	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	11	0	39	0
Series D Preferred Stock | Restricted stock | Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	7	0	17	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	$ 10	$ 0	$ 27	$ 0