Stock Based Compensation - Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stock Based Compensation
Total stock-based compensation expense	$ 841	$ 1,165	$ 2,921	$ 2,832
Estimated grant-date fair value of stock options calculated using the Black-Scholes option-pricing model
Volatility (as a percent)			164.00%
Expected term (years)			5 years	5 years
Risk-free interest rate (as a percent)			3.20%
Research and development expense
Stock Based Compensation
Total stock-based compensation expense	354	404	$ 1,067	$ 935
Sales and marketing expense
Stock Based Compensation
Total stock-based compensation expense	32	88	234	208
General and administrative expense
Stock Based Compensation
Total stock-based compensation expense	455	$ 673	1,620	$ 1,689
Stock options and RSUs
Stock Based Compensation
Unrecognized stock-based compensation expense	$ 2,200		$ 2,200
Expected weighted average period to be recognized			1 year 4 months 28 days
Minimum | Employee stock options
Estimated grant-date fair value of stock options calculated using the Black-Scholes option-pricing model
Volatility (as a percent)				163.80%
Risk-free interest rate (as a percent)				0.50%
Maximum | Employee stock options
Estimated grant-date fair value of stock options calculated using the Black-Scholes option-pricing model
Volatility (as a percent)				164.00%
Risk-free interest rate (as a percent)				1.00%