Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Stockholders' Equity Note [Abstract]

Summary of stock-based compensation expense

The following table summarizes stock-based compensation expense (income) and the impact it had on operations for the periods presented (in thousands):

	Three months ended June 30,					Six months ended June 30,
	2019			2018		2019		2018
Cost of sales	$	—		$	10	$	7	$	19
Product development	(6		)	30		22		55
Selling, general, and administrative	(14		)	195		494		356
Total stock-based compensation	$	(20	)	$	235	$	523	$	430

Schedule of valuation assumptions

Estimates utilized in the calculation include the expected life of the option, risk-free interest rate, and expected volatility, and are further comparatively detailed as follows:

	Six months ended June 30,
	2019			2018
Fair value of options issued	$	—		$	1.74
Exercise price	$	—		$	2.46
Expected life of options (in years)	—			5.8
Risk-free interest rate	—		%	2.3		%
Expected volatility	—		%	84.3		%
Dividend yield	0.0		%	0.0		%

Summary of option activity

A summary of option activity under all plans for the six months ended June 30, 2019 is presented as follows:

	Number of Options		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life (in years)
Balance at December 31, 2018	292,871		$	3.78
Canceled/forfeited	(129,896	)	2.67
Balance at June 30, 2019	162,975		$	4.67	5.5
Vested and expected to vest at June 30, 2019	162,629		$	4.67	5.5
Exercisable at June 30, 2019	157,701		$	4.72	5.5

Summary of restricted stock activity

A summary of restricted stock unit activity under all plans for the six months ended June 30, 2019 is presented as follows:

	Restricted Stock Units		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (in years)
Balance at December 31, 2018	546,858		$	2.54
Granted	27,187		1.16
Released	(377,894	)	2.54
Canceled/forfeited	(152,441	)	2.32
Balance at June 30, 2019	43,710		$	2.62	1.5