Note 13 - Equity-based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

(in thousands, except years and per share data)	Options			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life (years)		Aggregate Intrinsic Value
Outstanding at December 31, 2019		2,183		$	4.03		6.6	$	43
Options granted		20		$	0.57
Restricted stock units vested		(3	)	$	—
Options forfeited/cancelled		(100	)	$	8.12
Restricted stock units cancelled		(1	)	$	—
Outstanding at March 31, 2020		2,099		$	3.81		6.3	$	37
Vested and expected to vest at March 31, 2020		2,081		$	3.83		6.3	$	36
Vested at March 31, 2020		1,825		$	4.08		6.04	$	—
Exercisable at March 31, 2020		1,825		$	4.08		6.04	$	—

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended March 31,
(in thousands)	2020		2019
Research and development	$	7	$	11
Sales and Marketing		9		19
General and administrative		41		84
Total stock-based compensation expense	$	57	$	114

Employees and Directors [Member]

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended March 31,
Assumption	2020
Expected price volatility		143.83	%
Expected term (in years)		6.46
Risk-free interest rate		0.99	%
Dividend yield		0.00	%
Weighted-average fair value of options granted during the period	$	0.53