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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Stock-Based Compensation |
Summary of Stock Option Activity |
|  |  |  | Options Outstanding
|  |  |  |  |  | Weighted- |  | Weighted- |  |  |
|  |  |  |  |  | Average |  | Average |  |  |
|  | Options |  |  |  | Exercise |  | Remaining |  | Aggregate
|  | Available for |  | Number of |  | Price Per |  | Contractual |  | Intrinsic
|  | Grant |  | Options |  | Share |  | Life (years) |  | Value
|  |  |  |  |  |  |  |  |  |  | (In thousands)
Balance—December 31, 2017 |  | 83,929 |  | 1,593,195 |  | $ | 8.88 |  | 6.6 |  | $ | 1,997
Prior period adjustment |  | (1,026) |  | 13,784 |  |  | 4.54 |  |  |  |  |
Options authorized |  | 1,084,516 |  | — |  |  | — |  |  |  |  |
RSUs granted |  | (60,450) |  | — |  |  | — |  |  |  |  |
RSUs cancelled/forfeited |  | 1,900 |  | — |  |  | — |  |  |  |  |
Options granted |  | (310,715) |  | 310,715 |  |  | 8.79 |  |  |  |  |
Options exercised |  | — |  | (190,800) |  |  | 4.69 |  |  |  | $ | 815
Options cancelled/forfeited |  | 28,834 |  | (30,707) |  |  | 7.97 |  |  |  |  |
Balance—June 30, 2018 |  | 826,988 |  | 1,696,187 |  | $ | 7.28 |  | 7.2 |  | $ | 3,204
Options exercisable—June 30, 2018 |  |  |  | 746,702 |  | $ | 5.85 |  | 4.8 |  | $ | 2,355
Schedule of Restricted Stock Unit Activity |
|  | RSUs Outstanding
|  |  |  | Weighted-
|  |  |  | Average
|  | Number of |  | Grant Date
|  | Restricted Stock |  | Fair Value Per
|  | Units |  | Share
Balance—December 31, 2017 |  | 30,680 |  | $ | 10.55
Granted |  | 60,450 |  |  | 8.66
Cancelled/forfeited |  | (1,900) |  |  | 8.39
Balance—June 30, 2018 |  | 89,230 |  | $ | 9.32
Summary of Stock-Based Compensation Expense | The Company recognized stock-based compensation expense from awards granted to employees and non-employees under its equity incentive plans and from its ESPP as follows, excluding amounts related to GLOBALFOUNDRIES, Inc. (GF) (in thousands):
|  | Three Months Ended |  | Six Months Ended |
|  | June 30, |  | June 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Research and development |  | $ | 138 |  | $ | 73 |  | $ | 246 |  | $ | 245 |
General and administrative |  |  | 466 |  |  | 213 |  |  | 899 |  |  | 439 |
Sales and marketing |  |  | 113 |  |  | 122 |  |  | 197 |  |  | 155 |
Total |  | $ | 717 |  | $ | 408 |  | $ | 1,342 |  | $ | 839 |
Schedule of Fair Value Assumptions |
|  | Option Plan |  | ESPP |  |
|  | Six Months Ended |  | Six Months Ended |  |
|  | June 30, |  | June 30, |  |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |
Expected volatility |  | 51.9-53.1 | % | 47.2-59.3 | % | 59.5- 87.8 | % | 49.5 | % |
Risk-free interest rate |  | 2.6-2.9 | % | 2.0-2.1 | % | 0.9-2.1 | % | 0.5 | % |
Expected term (in years) |  | 5.7-6.1 |  | 5.8-6.1 |  | 0.5-1.0 |  | 0.5 |  |
Dividend yield |  | — | % | — | % | — | % | — | % |

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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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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