Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Share-Based Compensation Expense

For the years ended December 31, 2016, 2015 and 2014, the following table presents total share-based compensation expense in each functional line item on the consolidated statements of operations (in thousands):

	Year Ended December 31,
	2016		2015		2014
Cost of revenues	$	235	$	233	$	5
Research and development	868		1,003		654
Sales and marketing	707		579		247
General and administrative	2,778		2,963		1,384
Restructuring charges	—		1,572		1,298
Total	$	4,588	$	6,350	$	3,588

Share-based Compensation Stock Option Fair Value Assumptions

The following table presents the weighted-average assumptions used in the Hull-White I valuation model and the Black-Scholes valuation model by the Company in calculating the fair value of each Replacement Option and executive bonus stock option, respectively, granted under the 2015 Plan for the year ended December 31, 2015:

	Hull-White I
	Executive		Non-executive		Black-Scholes
Expected dividend yield	—	%	—	%	—	%
Risk-free interest rate	2.1	%	2.1	%	1.4	%
Volatility	64	%	64	%	67	%
Expected term (in years)	n/a		n/a		5.0
Suboptimal exercise factor	2.570		1.626		n/a
Post-vesting termination rate	3	%	3	%	n/a

The following table presents the weighted-average assumptions used in the Black-Scholes valuation model by the Company in calculating the fair value of each stock option granted under the 2009 Plan:

	Year Ended December 31,
	2016		2015		2014
Expected dividend yield	—	%	—	%	—	%
Risk-free interest rate	1.7	%	1.4	%	1.4	%
Volatility	79	%	69	%	80	%
Expected term (in years)	5.0		4.5		4.6

Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity under all plans for the years ended December 31, 2016 and 2015 (dollars in thousands, except per share data):

	Stock Options Outstanding		Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Outstanding — December 31, 2014	3,064,880		$	5.27
Granted	6,656,737		3.02
Exercised	(273,005	)	2.26
Canceled	(3,363,776	)	5.14
Outstanding — December 31, 2015	6,084,836		3.01
Granted	1,051,550		1.65
Exercised	(78,384	)	1.12
Canceled	(701,799	)	4.35
Outstanding — December 31, 2016	6,356,203		$	2.64	7.94	$	3,592
Vested and Expected to Vest — December 31, 2016	5,729,553		$	2.72	7.84	$	3,180
Exercisable — December 31, 2016	2,461,614		$	3.69	6.58	$	1,023

Summary of Restricted Stock Unit Activity

A summary of restricted stock unit activity under all plans for the year ended December 31, 2016 is presented below:

	Number of Shares		Weighted-Average Grant-Date Fair Value
Non-vested — December 31, 2015	960,203		$	3.39
Granted	2,914,000		1.62
Vested	(461,866	)	3.30
Forfeited	(436,537	)	2.03
Non-vested — December 31, 2016	2,975,800		$	1.87