Employee Equity-Based Compensation

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Employee Equity-Based Compensation

NOTE 12. EMPLOYEE EQUITY-BASED COMPENSATION

The following table summarizes option activity under all plans during the six months ended June 30, 2019:

	Number of Shares		Weighted Average Exercise Price per Share
Options Outstanding January 1, 2019	8,090,636		$	12.22
Granted	1,594,929		12.36
Forfeited	(283,856	)	20.68
Exercised	(260,821	)	16.75
Expired	(38,878	)	23.16
Options Outstanding June 30, 2019	9,102,010		$	11.80

The table below summarizes the resulting weighted average inputs used to calculate the estimated fair value of options awarded during the periods shown below:

	Three Months Ended
	June 30,			June 30,
	2019			2018
Expected term (in years)	5.65			6.06
Volatility	58		%	64		%
Expected dividends	—			—
Risk free interest rates	2.38		%	2.82		%
Weighted average fair value	$	11.08		$	13.53

The following table shows summary information for outstanding options and options that are exercisable (vested) as of June 30, 2019:

	Options Outstanding		Options Exercisable
Number of options	9,102,010		6,096,976
Weighted average remaining contractual term (in years)	5.83		4.47
Weighted average exercise price	$	11.80	$	8.94
Weighted average fair value	$	7.85	$	6.03
Aggregate intrinsic value (in thousands)	$	104,986	$	86,768

The following table summarizes RSU and restricted stock award activity during the six months ended June 30, 2019:

	Number of Shares		Weighted Average Grant Date Fair Value per Share
Outstanding January 1, 2019	76,000		$	18.70
Granted	11,000		20.32
Forfeited	(55,000	)	20.24
Vested/released	(7,000	)	19.47
Outstanding June 30, 2019	25,000		15.81

Equity-based compensation expense is summarized below (in thousands):

	Three Months Ended				Six Months Ended
	June 30,		June 30,		June 30,		June 30,
	2019		2018		2019		2018
Cost of sales	$	52	$	58	$	107	$	104
Research and development	802		838		2,329		2,450
Sales, general and administrative	2,027		2,513		3,842		6,457
	$	2,881	$	3,409	$	6,278	$	9,011

During the three months ended June 30, 2019 and 2018, $0.2 million and $0.1 million, respectively, of share-based compensation cost was capitalized to inventory or inventory transferred to property and equipment (also referred to as instruments). During the six months ended June 30, 2019 and 2018, $0.4 million and $0.5 million, respectively, of share-based compensation cost was capitalized to inventory or inventory transferred to property and equipment (also referred to as instruments).

As of June 30, 2019, unrecognized equity-based compensation expense related to unvested stock options and unvested RSUs was $19.5 million and $0.3 million, respectively. This is expected to be recognized over the years 2019 through 2024.

Included in the above-noted stock option grants and stock compensation expense are performance-based stock options which vest only upon the achievement of certain targets. Performance-based options are generally granted at-the-money, contingently vest over a period of 1 to 2 years, depending on the nature of the performance goal, and have contractual lives of 10 years. These options were valued in the same manner as the time-based options, with the assumption that performance goals will be achieved. The inputs for expected volatility, expected dividends, and risk-free rate used in estimating those options’ fair value are the same as the time-based options issued under the plan. The expected term for performance-based options granted in 2018 is 5 to 6 years. However, the Company only recognizes stock compensation expense to the extent that the targets are determined to be probable of being achieved, which triggers the vesting of the performance options. In 2018, the Company granted 225,000 performance based-options to certain employees. The Company recognized $0.1 million of stock compensation expense for the six months ended June 30, 2019 for performance-based stock options.