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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of option activity | The following is a summary of option activity (in thousands, except per share data):
|  |  |  |  |  |  | Weighted |  |  |  |  | Weighted |  |  |
|  |  |  | Weighted |  | Average |  |  |  |  | Average |  |  |
|  |  |  | Average |  | Share Price |  | Weighted |  | Remaining |  | Aggregate
|  | Number of |  | Exercise |  | on Date of |  | Average |  | Contractual |  | Intrinsic
|  | shares |  | Price |  | Exercise |  | Fair Value |  | Life |  | Value
|  | (in thousands, except price data)
Outstanding, January 1, 2018 |  | 536 |  | $ | 10.04 |  |  |  |  | $ | 5.19 |  |  |  | $ | 14,888
Exercised |  | (80) |  |  | 9.74 |  | $ | 32.95 |  |  | 4.90 |  |  |  |  | 1,847
Forfeited |  | (88) |  |  | 9.93 |  |  |  |  |  | 5.10 |  |  |  |  | 3,083
Outstanding, June 30, 2018 |  | 368 |  | $ | 10.13 |  |  |  |  | $ | 5.27 |  | 5.12 |  | $ | 12,802
Exercisable, June 30, 2018 |  | 368 |  | $ | 10.13 |  |  |  |  |  |  |  | 5.12 |  | $ | 12,802
Vested and expected to vest |  | 368 |  | $ | 10.13 |  |  |  |  |  |  |  | 5.12 |  | $ | 12,802
Summary of RSU/RSA activity | The following is a summary of RSU/RSA activity (in thousands, except per share data):
|  |  |  | Weighted |  |  |  |  |  |
|  |  |  | Average Share |  | Weighted |  | Aggregate
|  | Number of |  | Price on Date |  | Average Fair |  | Intrinsic
|  | shares |  | of Release |  | Value |  | Value
|  | (in thousands, except price data)
Outstanding at January 1, 2018 |  | 707 |  |  |  |  | $ | 29.23 |  | $ | 26,732
Granted |  | 517 |  |  |  |  |  | 33.77 |  |  | 17,444
Released |  | (166) |  | $ | 35.69 |  |  | 28.78 |  |  | 5,914
Cancelled/Forfeited |  | (25) |  |  |  |  |  | 32.15 |  |  | 1,110
Outstanding, June 30, 2018 |  | 1,033 |  |  |  |  | $ | 31.50 |  | $ | 46,384
Exercisable, June 30, 2018 |  | 4 |  |  |  |  |  |  |  | $ | 140
Vested and expected to vest |  | 1,033 |  |  |  |  |  |  |  | $ | 46,384
Schedule of employee stock-based compensation expenses | Employee share-based compensation expenses recognized for the periods indicated (in thousands):
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Share-based compensation - by expense type |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  | $ | 211 |  | $ | 134 |  | $ | 388 |  | $ | 212 |
Research and development |  |  | 676 |  |  | 441 |  |  | 1,252 |  |  | 706 |
Sales and marketing |  |  | 260 |  |  | 169 |  |  | 488 |  |  | 249 |
General and administrative |  |  | 1,752 |  |  | 1,516 |  |  | 3,340 |  |  | 2,600 |
Total share-based compensation expense |  | $ | 2,899 |  | $ | 2,260 |  | $ | 5,468 |  | $ | 3,767 |
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Share-based compensation - by award type |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options |  | $ | 12 |  | $ | 268 |  | $ | 12 |  | $ | 547 |
Restricted stock units |  |  | 2,887 |  |  | 1,992 |  |  | 5,456 |  |  | 3,220 |
Total share-based compensation expense |  | $ | 2,899 |  | $ | 2,260 |  | $ | 5,468 |  | $ | 3,767 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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