Stock Based Compensation - Stock Compensation Expense, Restricted Stock Units (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	$ 3	$ 15
Restricted Stock | Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	1
Restricted Stock | General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	3	14
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	74	350
RSUs | Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	10	43
RSUs | Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	12	50
RSUs | Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	0	7
RSUs | General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	52	250
Series D Preferred Stock | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock compensation expense	33	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	17	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	6	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