Share-Based Compensation |
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| Share-based Payment Arrangement [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Share-Based Compensation | Share-Based Compensation
As of June 30, 2019, the Company has two active share-based compensation plans, the 2018 Equity Incentive Plan and the 2011 Employee Stock Purchase Plan.
In January 2019, the Company granted market stock unit (“MSU”) awards to certain employees. These MSUs fully vest on December 31, 2021 and have separate market performance goals than the performance stock unit (“PSU”) awards the Company grants. Each MSU represents the right to one share of common stock. The actual number of MSUs which will be eligible to vest will be based on the performance of Natus' stock price over the vesting period. The maximum number of MSUs which will be eligible to vest are 200% of the MSUs initially granted. A Monte Carlo simulation model was used to estimate the fair value of the MSUs as of their grant date. This model simulates the stock price movements of the Company using certain assumptions, including the stock price of the company.
The terms of all other awards granted during the six months ended June 30, 2019 and the methods for determining grant-date fair value of the awards are consistent with those described in the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2018.
Details of share-based compensation expense are as follows (in thousands):
As of June 30, 2019, unrecognized compensation expense related to the unvested portion of stock options and other stock awards was approximately $13.5 million, which is expected to be recognized over a weighted average period of 2.5 years.
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