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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

Stock-Based Compensation

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

		Six months
		ended
		June 30, 2017
Risk-free interest rate		1.6%
Volatility		70.2%
Expected life (years)		4.0
Dividend yield		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 January 1, 2017		114		522		$	13.88
Additional shares authorized under the Plan		50		—			—
Restricted stock units cancelled and returned to the Plan		5		—			—
Options granted		(1)		1		$	2.36
Options cancelled and returned to the Plan		15		(15)		$	6.94
Balance at March 31, 2017		183		508		$	14.06
Restricted stock units cancelled and returned to Plan		37		—			—
Options cancelled and returned to Plan		172		(172)		$	10.20
Balance at June 30, 2017		392		336		$	16.04

Summary of RSU activity under the Plans

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

				Weighted
				Average
		Number of		Grant-Date
		Shares		Fair Value
Non-vested shares at January 1, 2017		148		$	8.13
Vested		(54)		$	11.64
Cancelled		(5)		$	5.30
Non-vested shares at March 31, 2017		89		$	6.16
Cancelled		(37)		$	5.75
Non-vested shares at June 30, 2017		52		$	6.46

Summary of significant ranges of outstanding and exercisable options

The following table summarizes significant ranges of outstanding and exercisable options as of June 30, 2017 (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
$2.36 - $7.19		29		6.86		$	5.15		12		$	5.30
$7.20 - $16.99		174		7.35		$	7.20		73		$	7.20
$17.00 - $20.49		6		2.69		$	17.00		6		$	17.00
$20.50 - $30.89		54		6.94		$	20.50		45		$	20.50
$30.90 - $46.19		67		1.94		$	36.44		67		$	36.44
$46.20 - $54.30		6		0.47		$	51.45		6		$	51.50
$2.36 - $54.30		336		6.12		$	16.04		209		$	20.95		$	—
Vested and expected to vest		323		5.81		$	16.38							$	—
Exercisable		209		4.35		$	20.95							$	—

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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-Publisher FASB
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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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-Publisher FASB
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