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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Stock Based Compensation - Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stock Based Compensation
Total stock-based compensation expense	$ 1,017	$ 1,031	$ 2,080	$ 1,667
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	365	366	$ 713	$ 531
Sales and marketing expense
Stock Based Compensation
Total stock-based compensation expense	120	68	202	121
General and administrative expense
Stock Based Compensation
Total stock-based compensation expense	532	$ 597	1,165	$ 1,015
Stock options and RSUs
Stock Based Compensation
Unrecognized stock-based compensation expense	$ 2,600		$ 2,600
Expected weighted average period to be recognized			1 year 7 months 24 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%