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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2016

Stockholders' Equity Note [Abstract]

Summary of common stock activity was as follows:



		Shares

Outstanding December 31, 2015		41,110,127
Issuance of common stock - option exercises		237,202
Issuance of restricted common stock		405,977
Outstanding March 31, 2016		41,753,306

Range of warrant prices per share for shares under warrants and the weighted average contractual life

At March 31, 2016 and December 31, 2015, the range of warrant prices per share for common stock underlying warrants and the weighted average contractual life was as follows:



March 31, 2016	Number of Warrants	Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life	Number of Warrants Exercisable	Weighted Average Price Per Share
Common Stock	751,779	$	10.30	1.08	751,779	$	10.30



December 31, 2015	Number of Warrants	Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life	Number of Warrants Exercisable	Weighted Average Price Per Share
Common Stock	751,779	$	10.30	1.33	751,779	$	10.30

Schedule of activity under all stock option plans

Stock option activity under all stock option plans was as follows:



	Number of Options		Weighted Average Exercise Price per Share
Outstanding December 31, 2015	5,248,329		$	5.56
Granted	—		—
Exercised	(237,202	)	3.48
Expired	(20,652	)	10.41
Cancelled/Forfeited	(29,413	)	9.23
Outstanding March 31, 2016	4,961,062		$	5.62
Total vested and exercisable	4,298,947		$	4.84

Assumptions used to estimate the fair value of options at date of grant

The fair value of options at date of grant was estimated using the Black-Scholes option pricing model, based on the following assumptions:



	Three Months Ended March 31,
	2016	2015
Risk-free interest rate	N/A	1.37% - 1.67%
Expected term (in years)	N/A	5.47 - 6.45
Dividend yield	N/A	—%
Expected volatility	N/A	50.00%

Summary of stock-based compensation expense

The following is a summary of stock-based compensation expense (in thousands):



	Three Months Ended March 31,
	2016		2015
Cost of revenues	$	61	$	110
Sales and marketing	251		210
Research and development	301		254
General and administrative	331		514
	$	944	$	1,088

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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