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Stock-Based Compensation Expense (Tables) | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock-Based Compensation Expense | Stock-based compensation expense for restricted stock, restricted stock units, stock options and issuances of common stock pursuant to our employee stock purchase plan was classified in the accompanying consolidated statements of operations as follows:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (in thousands)
Stock-based compensation expense: |  |  |  |  |  |  |  |
Cost of revenue |  | $ | 308 |  |  | $ | 142 |  |  | $ | 510 |  |  | $ | 279 |
Research and development |  | 1,689 |  |  | 1,524 |  |  | 3,202 |  |  | 3,017 |
Sales and marketing |  | 1,779 |  |  | 1,224 |  |  | 3,182 |  |  | 4,125 |
General and administrative |  | 1,395 |  |  | 751 |  |  | 2,556 |  |  | 1,739 |
Total stock-based compensation expense |  | $ | 5,171 |  |  | $ | 3,641 |  |  | $ | 9,450 |  |  | $ | 9,160 |
Summary of Restricted Stock and Restricted Stock Unit Activity | Restricted stock and restricted stock unit activity during the six months ended June 30, 2017 was as follows:
|  | Restricted Stock |  | Restricted Stock Units
|  | Shares |  | Weighted-Average Grant Date Fair Value |  | Shares |  | Weighted-Average Grant Date Fair Value
Unvested balance as of December 31, 2016 |  | 585,004 |  |  | $ | 18.05 |  |  | 734,577 |  |  | $ | 13.47 |
Granted |  | — |  |  | — |  |  | 1,423,010 |  |  | 14.11 |
Vested |  | (156,765 | ) |  | 19.04 |  |  | (200,416 | ) |  | 13.72 |
Forfeited |  | (7,698 | ) |  | 23.01 |  |  | (78,441 | ) |  | 13.62 |
Unvested balance as of June 30, 2017 |  | 420,541 |  |  | $ | 17.59 |  |  | 1,878,730 |  |  | $ | 13.92 |
Summary of Stock Option Activity | Stock option activity during the six months ended June 30, 2017 was as follows:
|  | Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2016 |  | 4,580,375 |  |  | $ | 8.20 |  |  |  |  |
Granted |  | 1,266,238 |  |  | 13.38 |  |  |  |  |
Exercised |  | (670,533 | ) |  | 6.13 |  |  |  |  | $ | 7,572 |
Forfeited/cancelled |  | (134,812 | ) |  | 12.41 |  |  |  |  |
Outstanding as of June 30, 2017 |  | 5,041,268 |  |  | $ | 9.66 |  |  | 7.5 |  | $ | 36,564 |
Vested and exercisable as of June 30, 2017 |  | 2,642,121 |  |  | $ | 6.57 |  |  | 6.0 |  | $ | 27,278 |
Vested and expected to vest as of June 30, 2017 |  | 4,544,979 |  |  | $ | 9.27 |  |  | 7.1 |  | $ | 34,726 |

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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=6415400&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=6415400&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 exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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