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COMMON STOCK AND STOCK-BASED COMPENSATION PLANS (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock Option Activity | A summary of the Company’s stock option and SARs activities and related information for the six months ended June 30, 2018, are as follows:
|  | Number of options and SAR units (1) |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic- value |
Outstanding as of December 31, 2017 |  |  | 729,017 |  |  | $ | 19.77 |  |  |  | 5.2 |  |  | $ | 19,229 |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (12,911 | ) |  |  | 15.90 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (1,461 | ) |  |  | 18.82 |  |  |  |  |  |  |  |  |
Outstanding as of June 30, 2018 (2) |  |  | 714,645 |  |  | $ | 19.84 |  |  |  | 4.8 |  |  | $ | 7,430 |
Exercisable as of June 30, 2018 (3) |  |  | 569,977 |  |  | $ | 18.74 |  |  |  | 4.2 |  |  | $ | 6,552 |
(1) | The SAR units are convertible for a maximum number of shares of the Company’s common stock equal to 75% of the SAR units subject to the grant.
(2) | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 651,296 shares of the Company’s common stock issuable upon exercise.
(3) | Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 515,045 shares of the Company’s common stock issuable upon exercise.
Summary of Restricted Stock Units Activity | A summary of the Company’s RSU activities and related information for the six months ended June 30, 2018, are as follows:
|  | Number of RSUs |  |  | Weighted Average Grant-Date Fair Value |
Unvested as of December 31, 2017 |  |  | 560,616 |  |  | $ | 29.31 |
Granted |  |  | 255,500 |  |  |  | 35.77 |
Vested |  |  | (229,821 | ) |  |  | 25.06 |
Forfeited or expired |  |  | (17,333 | ) |  |  | 37.10 |
Unvested as of June 30, 2018 |  |  | 568,962 |  |  | $ | 33.69 |
Equity-Based Compensation Expense Included in Interim Condensed Consolidated Statements of Income | The following table shows the total equity-based compensation expense included in the interim condensed consolidated statements of income:
|  | Six months ended June 30, |  |  | Three months ended June 30, |
|  | 2018 (unaudited) |  |  | 2017 (unaudited) |  |  | 2018 (unaudited) |  |  | 2017 (unaudited) |
Cost of revenue |  | $ | 325 |  |  | $ | 205 |  |  | $ | 168 |  |  | $ | 114 |
Research and development, net |  |  | 2,628 |  |  |  | 1,843 |  |  |  | 1,359 |  |  |  | 972 |
Sales and marketing |  |  | 877 |  |  |  | 659 |  |  |  | 423 |  |  |  | 370 |
General and administrative |  |  | 1,786 |  |  |  | 1,420 |  |  |  | 895 |  |  |  | 722 |
Total equity-based compensation expense |  | $ | 5,616 |  |  | $ | 4,127 |  |  | $ | 2,845 |  |  | $ | 2,178 |
Assumptions Used to Estimate Fair Value of Employee Stock Purchase Plan | The fair value for rights to purchase shares of common stock under the Company’s employee stock purchase plan was estimated on the date of grant using the following assumptions:
|  | Six months ended June 30, |
|  | 2018 (unaudited) |  |  | 2017 (unaudited) |
Expected dividend yield |  |  | 0% |  |  |  | 0% |
Expected volatility |  |  | 35%-42% |  |  |  | 35%-46% |
Risk-free interest rate |  |  | 0.7%1.6% |  |  |  | 0.5%0.7% |
Contractual term of up to |  |  | 24 months |  |  |  | 24 months |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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