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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
Restricted Stock Units
Lonestar grants awards of restricted stock units ("RSUs") to employees and directors as part of its long-term compensation program. For the six months ended June 30, 2020 and 2019, the Company recognized $(1.2) million and $1.3 million, respectively, of stock-based compensation (benefit) expense for RSUs. The liability for RSUs on the accompanying consolidated balance sheet as of June 30, 2020 was $0.1 million.
As of June 30, 2020, there was $0.4 million of unrecognized compensation expense related to non-vested RSU grants. This unrecognized compensation cost is expected to be recognized over a weighted-average period of 1.6 years. The fair value of RSU grants that vested during the three months ended June 30, 2020 totaled $0.1 million.
A summary of the status of the Company's non-vested RSU grants issued, and the changes during the six months ended June 30, 2020 is presented below:
SharesWeighted Average Fair Value per Share
Non-vested RSUs at December 31, 20191,849,676  $4.04  
Granted—  —  
Vested(857,800) 0.65  
Forfeited(102,623) —  
Non-vested RSUs at June 30, 2020889,253  $3.41  
Stock Appreciation Rights
In the past, Lonestar has granted awards of stock appreciation rights (“SARs”) to employees and directors as part of its long-term compensation program. For the six months ended June 30, 2020 and 2019, the Company recognized $(0.5) million and $(0.3) million, respectively, of stock-based compensation (benefit) expense for SARs. The liability for SARs on the accompanying unaudited consolidated balance sheet as of June 30, 2020 was not material.
As of June 30, 2020, the total compensation cost to be recognized in future periods related to non-vested SAR grants was not material. The cost is expected to be recognized over a weighted-average period of 0.8 year.
The following is a summary of the Company's SAR activity:
SharesWeighted Average Exercise Price Per ShareWeighted Average Remaining Contractual Term
(in years)
Outstanding at December 31, 20191,010,000  $6.30  2.5
SARs vested and exercisable at December 31, 2019606,250  6.65  2.4
Granted—  —  —  
Exercised—  —  —  
Expired/forfeited—  —  —  
Outstanding at June 30, 20201,010,000  $6.30  2.3
SARs vested and exercisable at June 30, 2020805,000  $6.79  1.8