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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Share-Based Compensation Expense | For the years ended December 31, 2018 and 2017, the following table presents total share-based compensation expense in each functional line item on the consolidated statements of operations (in thousands):
| Year Ended December 31,
| 2018 |  | 2017
Cost of revenues | $ | 390 |  |  | $ | 182 |
Research and development | 1,017 |  |  | 749 |
Sales and marketing | 970 |  |  | 747 |
General and administrative | 2,499 |  |  | 1,901 |
Restructuring charges | — |  |  | 169 |
Total | $ | 4,876 |  |  | $ | 3,748 |
Share-based Compensation Stock Option Fair Value Assumptions | The following table presents the weighted-average assumptions used in the Black-Scholes valuation model by the Company in calculating the fair value of each stock option granted:
| Year Ended December 31,
| 2018 |  | 2017
Expected dividend yield | — | % |  | — | %
Risk-free interest rate | 2.8 | % |  | 1.8 | %
Volatility | 84 | % |  | 108 | %
Expected term (in years) | 5.8 |  |  | 5.0 |
Summary of Stock Option Activity | The following table summarizes the Company’s stock option activity for the years ended December 31, 2018 and 2017 (dollars in thousands, except per share data):
| Stock Options Outstanding |  | Weighted-Average Exercise Price Per Option |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Outstanding — December 31, 2017 | 6,566,483 |  |  | $ | 1.77 |  |  |  |  |
Granted | 5,106,892 |  |  | 2.18 |  |  |  |  |
Exercised | (1,611,731 | ) |  | 1.25 |  |  |  |  |
Canceled | (1,265,432 | ) |  | 1.80 |  |  |  |  |
Outstanding — December 31, 2018 | 8,796,212 |  |  | $ | 2.10 |  |  | 8.44 |  | $ | 19,124 |
Vested and Expected to Vest — December 31, 2018 | 7,407,752 |  |  | $ | 2.10 |  |  | 8.25 |  | $ | 16,269 |
Exercisable — December 31, 2018 | 2,748,498 |  |  | $ | 2.30 |  |  | 6.46 |  | $ | 6,145 |
Summary of Restricted Stock Unit Activity | A summary of restricted stock unit activity under all plans for the year ended December 31, 2018 is presented below:
| Number of Shares |  | Weighted-Average Grant-Date Fair Value
Non-vested — December 31, 2017 | 1,055,977 |  |  | $ | 2.06 |
Granted | 966,747 |  |  | 2.01 |
Vested | (1,110,138 | ) |  | 1.96 |
Forfeited | (458,204 | ) |  | 2.07 |
Non-vested — December 31, 2018 | 454,382 |  |  | $ | 2.17 |

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- Definition Tabular disclosure for share-based compensation 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 (e) -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 (c)(2) -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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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 stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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