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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Stock-Based Compensation Expense | The following table presents stock-based compensation expense included in the Company’s consolidated statements of comprehensive income (in thousands):
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Cost of product revenue |  | $ | 153 |  |  | $ | 84 |  |  | $ | 294 |  |  | $ | 144 |
Research and development |  |  | 79 |  |  |  | 105 |  |  |  | 211 |  |  |  | 185 |
Selling, general and administrative |  |  | 1,264 |  |  |  | 948 |  |  |  | 2,522 |  |  |  | 1,730 |
Total |  | $ | 1,496 |  |  | $ | 1,137 |  |  | $ | 3,027 |  |  | $ | 2,059 |
Summary of Option Activity | Information regarding option activity for the six-month period ended June 30, 2017 under the Plans is summarized below:
|  | Options Outstanding |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | (in thousands) Aggregate Intrinsic Value |
Options outstanding at December 31, 2016 |  |  | 882,748 |  |  | $ | 16.88 |  |  |  |  |  |  |  |  |
Granted |  |  | 101,844 |  |  |  | 33.38 |  |  |  |  |  |  |  |  |
Exercised |  |  | (149,903 | ) |  |  | 10.04 |  |  |  |  |  |  |  |  |
Forfeited/cancelled |  |  | (31,157 | ) |  |  | 20.27 |  |  |  |  |  |  |  |  |
Options outstanding at June 30, 2017 |  |  | 803,532 |  |  | $ | 20.16 |  |  |  | 6.90 |  |  | $ | 17,145 |
Options exercisable at June 30, 2017 |  |  | 439,980 |  |  | $ | 14.98 |  |  |  | 5.71 |  |  | $ | 11,695 |
Vested and expected to vest at June 30, 2017 (1) |  |  | 790,545 |  |  | $ | 20.04 |  |  |  | 6.87 |  |  | $ | 16,921 |
(1) | Represents the number of vested options as of June 30, 2017 plus the number of unvested options expected to vest as of June 30, 2017 based on the unvested outstanding options at June 30, 2017 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.
Summary of Restricted Stock Unit Activity | Information regarding restricted stock unit activity for the three months ended June 30, 2017 under the Plans is summarized below:
|  | Options Outstanding |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | (in thousands) Aggregate Intrinsic Value |
Restricted stock units outstanding at December 31, 2016 |  |  | 353,838 |  |  | $ | — |  |  |  |  |  |  |  |  |
Granted |  |  | 146,154 |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (94,261 | ) |  |  | — |  |  |  |  |  |  |  |  |
Forfeited/cancelled |  |  | (12,393 | ) |  |  | — |  |  |  |  |  |  |  |  |
Restricted stock units outstanding at June 30, 2017 |  |  | 393,338 |  |  | $ | — |  |  |  | 2.93 |  |  | $ | 16,300 |
Vested and expected to vest at June 30, 2017 (1) |  |  | 362,788 |  |  | $ | — |  |  |  | 2.82 |  |  | $ | 15,034 |
(1) | Represents the number of vested restricted stock units as of June 30, 2017 plus the number of unvested restricted stock units expected to vest as of June 30, 2017 based on the unvested outstanding restricted stock units at June 30, 2017 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

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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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