On April 20, 2016, the stockholders of the Company approved the ORBCOMM Inc. 2016 Long-Term Incentives Plan (the “2016 LTIP”). The 2016 LTIP replaces the Company’s 2006 Long-Term Incentive Plan (the “2006 LTIP”). The number of shares authorized for delivery under the 2016 LTIP is 6,949,400 shares, including 1,949,400 shares that remained available under the 2006 LTIP as of February 17, 2016, plus any shares previously subject to awards under the 2006 LTIP that are cancelled, forfeited or lapse unexercised after that date. As of December 31, 2018, there were 3,106,299 shares available for grant under the 2016 LTIP.

For the years ended December 31, 2018, 2017 and 2016, the Company recognized stock-based compensation expense of $7,910, $5,673, and $5,023, respectively. For the years ended December 31, 2018, 2017 and 2016, the Company capitalized stock-based compensation of $503, $453, and $316, respectively. The Company has not recognized, and currently does not expect to recognize in the foreseeable future, any tax benefit related to stock-based compensation as a result of the full valuation allowance on its net deferred tax assets and its net operating loss carryforwards generated in the U.S.

The following table summarizes the components of stock-based compensation expense in the Consolidated Statements of Operations for the years ended December 31, 2018, 2017 and 2016:

	Years Ended December 31,
	2018		2017		2016
Cost of services	$	666	$	525	$	559
Cost of product sales		162		78		44
Selling, general and administrative		6,065		4,706		4,082
Product development		1,017		364		338
Total	$	7,910	$	5,673	$	5,023

As of December 31, 2018, the Company had unrecognized compensation costs for all share-based payment arrangements totaling $10,734.

A summary of the Company’s time-based Stock Appreciation Rights (“SARs”) for the year ended December 31, 2018 is as follows:

	Number of Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (years)		Aggregate Intrinsic Value
Outstanding at January 1, 2018		2,564,394		$	5.38
Granted		—			—
Exercised		(345,300	)		4.93
Forfeited or expired		(20,000	)		8.58
Outstanding at December 31, 2018		2,199,094		$	5.36		3.69	$	5,514
Exercisable at December 31, 2018		2,139,094		$	5.41		3.56	$	5,867
Vested and expected to vest at December 31, 2018		2,199,094		$	5.36		3.69	$	5,514

For the years ended December 31, 2018, 2017 and 2016, the Company recorded stock-based compensation expense of $187, $589 and $270 related to these time-based SARs, respectively. As of December 31, 2018, $182 of total unrecognized compensation cost related to the time-based SARs is expected to be recognized through December 2019.

The weighted-average grant date fair value of the time-based SARs granted in 2017 was $4.85 and per share, respectively. There were no time-based SARs granted during the year ended December 31, 2018 and 2016.

The intrinsic value of the time-based SARs exercised during the year ended December 31, 2018 was $1,833.

A summary of the Company’s performance-based SARs for the year ended December 31, 2018 is as follows:

	Number of Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (years)		Aggregate Intrinsic Value
Outstanding at January 1, 2018		504,473		$	5.80
Granted		—			—
Exercised		(186,187	)		2.74
Forfeited or expired		(84,790	)		11.00
Outstanding at December 31, 2018		233,496		$	6.02		4.62	$	1,418
Exercisable at December 31, 2018		233,496		$	6.02		4.62	$	1,418
Vested and expected to vest at December 31, 2018		233,496		$	6.02		4.62	$	1,418

For the years ended December 31, 2018, 2017 and 2016, the Company recorded stock-based compensation expense of $0, $0 and $2 related to these performance-based SARs, respectively. As of December 31, 2018, no unrecognized compensation cost related to the performance-based SARs is expected to be recognized.

There were no performance-based SARs granted during the years ended December 31, 2018, 2017 and 2016.

The intrinsic value of the performance-based SARs exercised during the year ended December 31, 2018 was $1,390.

The fair value of each time-based and performance-based SAR award is estimated on the date of grant using the Black-Scholes option pricing model with the assumptions described below. For the period indicated, the expected volatility was based on the Company’s historical volatility over the expected terms of the SAR awards. Estimated forfeitures were based on voluntary and involuntary termination behavior, as well as an analysis of actual forfeitures. The risk-free interest rate was based on the U.S. Treasury yield curve at the time of the grant over the expected term of the SAR grants. The Company did not grant time-based or performance-based SARs during the years ended December 31, 2018 and 2016.

	Year Ended December 31,
	2018	2017		2016
Risk-free interest rate	None	2.10%		None
Expected life (years)	None		6.0	None
Estimated volatility factor	None	59.85%		None
Expected dividends	None	None		None

A summary of the Company’s time-based Restricted Stock Units (“RSUs”) for the year ended December 31, 2018 is as follows:

	Shares			Weighted-Average Grant Date Fair Value
Balance at January 1, 2018		818,480		$	9.95
Granted		606,249			9.44
Vested		(432,189	)		9.32
Forfeited or expired		(72,516	)		10.46
Balance at December 31, 2018		920,024		$	9.60

For the years ended December 31, 2018, 2017 and 2016, the Company recorded stock-based compensation expense of $4,627, $3,084 and $2,495 related to these time-based RSUs, respectively. As of December 31, 2018, $6,449 of total unrecognized compensation cost related to the time-based RSUs is expected to be recognized through June 2022.

A summary of the Company’s performance-based RSUs for the year ended December 31, 2018 is as follows:

	Shares			Weighted-Average Grant Date Fair Value
Balance at January 1, 2018		444,734		$	9.48
Granted		387,748			9.15
Vested		(168,068	)		9.16
Forfeited or expired		(50,809	)		9.41
Balance at December 31, 2018		613,605		$	9.44

For the years ended December 31, 2018, 2017 and 2016, the Company recorded stock-based compensation expense of $2,478, $955 and $1,387 related to these performance-based RSUs, respectively. As of December 31, 2018, $4,103 of total unrecognized compensation cost related to the performance-based RSUs is expected to be recognized through March 2020.

The fair value of the time-based and performance-based RSU awards are based upon the closing stock price of the Company’s common stock on the date of grant.

The Company grants Market Performance Units (“MPUs”) to its senior executives based on stock price performance over a three-year period measured on December 31 of each year in the performance period. The MPUs will vest in equal installments at the end of each year in the performance period only if the Company satisfies the stock price performance targets and the senior executives continue employment through the dates the Compensation Committee has determined that the targets have been achieved. The value of the MPUs that will be earned each year ranges up to 15% of each of the senior executives’ base salaries in the year of the grant, depending on the Company’s stock price performance target for that year. The value of the MPUs can be paid in either cash, common stock or a combination of cash and common stock at the Company’s discretion. The MPUs are classified as a liability on the consolidated balance sheets and are revalued at the end of each reporting period based on the awards’ fair value over a three-year period.

As of December 31, 2018, the Compensation Committee determined that the fiscal year 2018 stock price performance targets were partially achieved for the 2018, 2017 and 2016 MPUs.

As the MPUs contain both performance and service conditions, they have been treated as a series of three separate awards, or tranches, for purposes of recognizing stock-based compensation expense. The Company recognizes stock-based compensation expense on a tranche-by-tranche basis over the requisite service period for that specific tranche. The Company estimated the fair value of the MPUs using a Monte Carlo simulation model based on the following assumptions:

	Years Ended December 31,
	2018	2017	2016
Risk-free interest rate	2.46% to 2.63%	1.76% to 1.98%	0.85% to 1.47%
Estimated volatility factor	29.0% to 32.0%	27.0% to 31.0%	33.0% to 36.0%
Expected dividends	None	None	None

For the years ended December 31, 2018, 2017 and 2016, the Company recorded stock-based compensation of $346, $862 and $781 relating to these MPUs, respectively.

As of December 31, 2018, the Company recorded $527 and $131 in accrued liabilities and other non-current liabilities related to the MPUs, respectively, on the Consolidated Balance Sheet. As of December 31, 2017, the Company recorded $895 and $301 in accrued liabilities and other non-current liabilities related to the MPUs, respectively, on the Consolidated Balance Sheet.

In January 2018, the Company issued 81,277 shares of common stock as a form of payment in connection with MPUs for achieving the fiscal year 2017 stock performance targets for the 2017, 2016 and 2015 MPUs.

On February 16, 2016, the Company’s board of directors adopted the ORBCOMM Inc. Employee Stock Purchase Plan (“ESPP”), which was approved by the Company’s shareholders on April 20, 2016. Under the terms of the ESPP, 5,000,000 shares of the Company’s common stock are available for issuance and eligible employees may have up to 10% of their gross pay deducted from their payroll, up to a maximum of $25 per year, to purchase shares of ORBCOMM common stock at a discount of up to 15% of its fair market value, subject to certain conditions and limitations. For the years ended December 31, 2018, 2017 and 2016, the Company recorded stock-based compensation expense of $272, $183 and $88, respectively, relating to the ESPP. For the year ended December 31, 2018, 71,440 shares and 81,525 shares of the Company’s common stock were purchased under the ESPP at a price of $8.06 and $8.21 per share, respectively. For the year ended December 31, 2017, 75,888 shares and 53,950 shares of the Company’s common stock were purchased under the ESPP at a price of $6.97 and $8.81 per share, respectively.