Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

Summary of Warrant Activity

A summary of warrant activity was as follows:

	Warrants Outstanding		Weighted Average ExercisePrice During Period
Balance, December 31, 2012	1,305,638		$	7.60
Warrants issued	2,549		3.49
Warrants expired	(200,638	)	19.70
Balance, December 31, 2013	1,107,549		4.41
Warrants issued	147,000		4.65
Warrants expired	(285,000	)	3.87
Balance, December 31, 2014	969,549		4.61
Warrants exercised	(638,189	)	4.58
Warrants cancelled/forfeited	(112,110	)	5.54
Warrants expired	(205,000	)	4.20
Balance, December 31, 2015	14,250		$	4.30
Exercisable, December 31, 2015	—		$	—

Schedule of Warrants

The number of warrants and weighted average remaining life (in years) by price for outstanding and exercisable warrants at December 31, 2015 was as follows:

WARRANTS OUTSTANDING				WARRANTS EXERCISABLE
Exercise Price		Number of Shares Outstanding	Weighted Average Remaining Contractual Life	Number of Shares Exercisable	Weighted Average Exercise Price
$	4.30	14,250	2.07 years	—	$	—

Summary of Impact of Results of Stock-Based Compensation

The impact on our results for stock-based compensation was as follows (in thousands):

	For the year ended December 31,
	2015		2014		2013
Cost of sales	$	38	$	14	$	5
Product development	37		8		28
Selling, general, and administrative	738		510		168
Total stock-based compensation	$	813	$	532	$	201

Schedule of Share-Based Payment Award, Stock Options, 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:

	2015			2014			2013
Fair value of options issued	$	5.33		$	3.62		$	2.15
Exercise price	$	7.23		$	4.69		$	2.99
Expected life of option (in years)	5.8			5.7			7
Risk-free interest rate	1.7		%	1.8		%	1.4		%
Expected volatility	90.7		%	97.9		%	92.0		%
Dividend yield	0.00		%	0.00		%	0.00		%

Summary of Option Activity

A summary of option activity under all plans was as follows:

	Number of Options		Weighted Average Exercise Price Per Share
Outstanding at December 31, 2012	218,458		$	22.00
Granted	207,950		3.15
Cancelled	(138,220	)	7.74
Exercised	(2,000	)	5.15
Outstanding at December 31, 2013	286,188		15.30
Granted	326,250		4.76
Cancelled	(145,873	)	12.38
Exercised	(7,294	)	2.30
Outstanding at December 31, 2014	459,271		8.95
Granted	340,500		8.65
Cancelled	(147,152	)	10.10
Exercised	(50,412	)	4.69
Outstanding at December 31, 2015	602,207		$	8.58
Vested and expected to vest at December 31, 2015	565,137		$	8.71
Exercisable at December 31, 2015	304,610		$	9.38

Schedule of Options Outstanding

The options outstanding at December 31, 2015 have been segregated into ranges for additional disclosure as follows:

OPTIONS OUTSTANDING							OPTIONS EXERCISABLE
Range ofExercise Prices			Number of Shares Outstanding	Weighted Average Remaining Contractual Life (in years)	Weighted Average Exercise Price		Number of Shares Exercisable	Weighted Average Remaining Contractual Life (in years)	Weighted Average Exercise Price
$2.30	—	$4.00	61,218	7.3	$	2.33	60,586	7.3	$	2.33
$4.01	—	$4.45	132,778	8.1	4.10		114,187	8.1	4.10
$4.46	—	$5.48	198,200	9.1	5.42		25,700	8.5	5.07
$5.49	—	$13.58	108,011	7.5	8.36		62,137	6.8	8.46
$13.59	—	$71.90	102,000	7.4	24.56		42,000	4.0	37.89
			602,207	8.1	$	8.58	304,610	7.1	$	9.38

Summary of Restricted Stock Activity

The following table shows a summary of restricted stock and restricted stock unit activity:

	Restricted Stock Outstanding		Restricted Stock Units Outstanding		Weighted Average Grant Date Fair Value
At December 31, 2012	41,461		—		$	7.31
Granted	—		—		—
Vested	(5,592	)	—		7.31
At December 31, 2013	35,869		—		7.31
Granted	—		—		—
Vested	(35,869	)	—		7.31
At December 31, 2014	—		—		—
Granted	—		73,750		6.92
Cancelled	—		(16,250	)	5.54
At December 31, 2015	—		57,500		$	7.31