Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

Stockholders' Equity Note [Abstract]

Summary of stock-based compensation expense

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

	Three months ended March 31,
	2019		2018
Cost of sales	$	7	$	9
Product development	28		25
Selling, general, and administrative	508		161
Total stock-based compensation	$	543	$	195

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:

	Three months ended March 31,
	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 three months ended March 31, 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
Granted	—		—
Exercised	—		—
Canceled/forfeited	(119,896	)	2.23
Expired	—		—
Balance at March 31, 2019	172,975		$	4.86	5.7
Vested and expected to vest at March 31, 2019	172,462		$	4.86	5.7
Exercisable at March 31, 2019	166,527		$	4.92	5.6

Summary of restricted stock activity

A summary of restricted stock unit activity under all plans for the three months ended March 31, 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	16,580		1.16
Released	(340,185	)	2.61
Canceled/forfeited	(125,716	)	2.26
Balance at March 31, 2019	97,537		$	2.36	1.1