Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of assumptions used in estimation of fair value of the share-based payment awards on the grant date



	Three Months Ended		Nine Months Ended
	September 30,		September 30,
Employee stock options:	2016	2015	2016	2015
Risk-free interest rate	1.0% -1.2%	1.4%	1.0% -1.2%	0.6% - 1.7%
Volatility	61.4% - 63.8%	59.3%	61.4% - 63.8%	55.7% - 59.3%
Expected life (years)	4.0 - 5.0	4.0	4.0 - 5.0	4.0 - 5.0
Dividend yield	0%	0%	0%	0%

Summary of option and RSU activity under Amended and Restated 2000 Stock Option and Equity Incentive Plan and Amended and Restated 2010 Equity Incentive Plan


		Options outstanding
			Weighted
	Shares		Average
	Available	Number of	Exercise
	for Grant	Shares	Prices
Balance at December 31, 2015	1,059	6,749	$	3.51
Additional shares authorized under the Amended 2010 Plan	500	—		—
Restricted stock units cancelled and returned to Plan	14	—		—
Options cancelled and returned to Plan	232	(232)	$	3.30
Options cancelled and expired	—	(80)	$	4.18
Balance at March 31, 2016	1,805	6,437	$	3.51
Additional shares authorized under the Amended 2010 Plan	2,000	—		—
Restricted stock units cancelled and returned to Plan	2	—		—
Options cancelled and returned to Plan	413	(413)	$	3.87
Options cancelled and expired	—	(500)	$	4.53
Balance at June 30, 2016	2,220	5,524	$	3.40
Restricted stock units granted	(1,439)	—		—
Restricted stock units cancelled and returned to Plan	43	—		—
Options granted	(3,778)	3,778	$	0.70
Options cancelled and returned to Plan	3,726	(3,726)	$	3.50
Balance at September 30, 2016	772	5,576	$	1.50

Summary of the inducement grant option activity

A summary of the inducement grant option activity is presented below (in thousands, except exercise price):


	Options Outstanding
		Weighted
		Average
	Number of	Exercise
	Shares	Prices
Balance at December 31, 2015	1,640	$	4.37
Cancelled	(139)	$	3.87
Balance at March 31, 2016	1,501	$	4.42
Cancelled	(366)	$	3.83
Balance at June 30, 2016	1,135	$	4.61
Cancelled	(1,135)	$	4.61
Balance at September 30, 2016	—	$	—

Summary of RSU activity under the Plans

A summary of RSU activity under the Plans is presented below (in thousands, except for fair value):


		Weighted
		Average
	Number of	Grant-Date
	Shares	Fair Value
Non-vested shares at December 31, 2015	241	$	4.61
Vested	(107)	$	4.62
Cancelled	(14)	$	4.62
Non-vested shares at March 31, 2016	120	$	4.61
Vested	(13)	$	4.58
Cancelled	(2)	$	4.13
Non-vested shares at June 30, 2016	105	$	4.62
Granted	1,439	$	0.53
Cancelled	(43)	$	0.80
Non-vested shares at September 30, 2016	1,501	$	0.81

Summary of significant ranges of outstanding and exercisable options

The following table summarizes significant ranges of outstanding and exercisable options as of September 30, 2016 (in thousands, except contractual life and exercise price):


	Options Outstanding				Options Exercisable
		Weighted
		Average
		Remaining	Weighted			Weighted
		Contractual	Average			Average		Aggregate
	Number	Life	Exercise		Number	Exercise		Intrinsic
Range of Exercise Price	Outstanding	(in Years)	Price		Exercisable	Price		value
$0.53 - $0.71	388	8.99	$	0.53	51	$	0.53
$0.72 - $0.76	3,278	9.89	$	0.72	93	$	0.72
$0.77 - $3.09	1,097	6.04	$	2.28	812	$	2.43
$3.10 - $5.42	713	3.00	$	3.82	699	$	3.81
$5.43 - $6.10	60	0.81	$	5.43	60	$	5.43
$6.11 - $6.11	40	0.57	$	6.11	40	$	6.11
$0.53 - $6.11	5,576	8.03	$	1.50	1,755	$	3.02	$	184
Vested and expected to vest	5,158	7.89	$	1.56				$	166
Exercisable	1,755	4.36	$	3.02				$	14