Stock-based compensation. (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of option activity

	Years Ended December 31,
	2020					2019
	Number of Shares			Weighted Average Exercise Price		Number of Shares		Weighted Average Exercise Price
Outstanding at beginning of year		229		$	4.15		229	$	4.15
Options exercised		(22	)		3.74		—		—
Outstanding at end of year		207		$	4.16		229	$	4.15
Options exercisable at end of year		207		$	4.16		229	$	4.15

Schedule of stock options by exercise price range

		Options Outstanding						Options Exercisable
Range of Exercise Prices		Number Outstanding		Weighted Average Remaining Contractual Life (yrs.)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$	3.74		197		2.47	$	3.74		197	$	3.74
$	12.90		10		0.59	$	12.90		10	$	12.90

Schedule of unvested restricted stock activity

	Number of Shares			Weighted Average Grant Date Fair Value Per Share
Unvested at December 31, 2019		2,201		$	1.84
Issued		1,663		$	1.25
Vested		(1,290	)	$	2.08
Canceled		(314	)	$	1.33
Unvested at December 31, 2020		2,260		$	1.34

Schedule of stock-based compensation expense

	Years Ended December 31,
	2020		2019
Employees	$	2,025	$	2,422
Non-employees		654		387
Total stock-based compensation expense	$	2,679	$	2,809