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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Stock Option Activity | A summary of the Company’s stock option activity for the six months ended June 30, 2015 was as follows:
| Options |  | Weighted-Average Exercise Price
Outstanding at December 31, 2014 | 1,383,479 |  |  | $ | 5.13 |
Granted | 1,510,759 |  |  | $ | 0.95 |
Exercised | — |  |  | — |
Forfeited | (962,015 | ) |  | $ | 2.90 |
Expired | (359,472 | ) |  | $ | 2.86 |
Outstanding at June 30, 2015 | 1,572,751 |  |  | $ | 3.00 |
Exercisable at June 30, 2015 | 504,121 |  |  | $ | 7.19 |
Vested and expected to vest at June 30, 2015 | 1,523,604 |  |  | $ | 3.06 |
Schedule of Black-Scholes-Merton Option Pricing Model | The following assumptions were used in the Black-Scholes valuation model related to non-employee stock options granted during the six months ended June 30, 2014:
Weighted-average risk-free interest rate | 2.69 | %
Weighted-average expected life (in years) | 9.9 |
Expected dividend yield | — | %
Weighted-average expected volatility | 45 | %
Summary of Restricted Stock Unit Activity | Restricted stock awards (“RSA”) activity for the six months ended June 30, 2015 was as follows:
| Number of Awards |  | Weighted-Average Grant Date Fair Value
Unvested at December 31, 2014 | — |  |  | $ | — |
Granted | 30,000 |  |  | $ | 0.75 |
Vested | (30,000 | ) |  | $ | 0.75 |
Forfeited | — |  |  | $ | — |
Unvested at June 30, 2015 | — |  |  | $ | — |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | Total stock-based compensation expense included in the condensed consolidated statements of operations and comprehensive loss was allocated as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
2015 |  | 2014 |  | 2015 |  | 2014
Cost of revenue | $ | 5 |  |  | $ | 213 |  |  | $ | 34 |  |  | $ | 215 |
Research and development | 37 |  |  | 712 |  |  | 159 |  |  | 799 |
General and administrative | 31 |  |  | 4,625 |  |  | 359 |  |  | 5,477 |
Selling and marketing | 10 |  |  | 1,291 |  |  | 152 |  |  | 1,711 |
Capitalized into inventory | 7 |  |  | 579 |  |  | 46 |  |  | 622 |
Total stock-based compensation expense | $ | 90 |  |  | $ | 7,420 |  |  | $ | 750 |  |  | $ | 8,824 |
Schedule of Unrecognized Compensation Cost, Nonvested Awards | Unrecognized stock-based compensation at June 30, 2015 was as follows (in thousands):
| Unrecognized Stock-Based Compensation |  | Weighted Average Remaining Period of Recognition (in years)
Stock options | $ | 689 |  |  | 2.2
Employee Stock Option |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Schedule of Black-Scholes-Merton Option Pricing Model | The following weighted average assumptions were used in the calculation to estimate the fair value of options granted to employees six months ended June 30, 2015 and 2014:
| Six Months Ended June 30,
2015 |  | 2014
Weighted-average risk-free interest rate | 1.63 | % |  | 1.84 | %
Weighted-average expected life (in years) | 6.3 |  |  | 6.3 |
Expected dividend yield | — | % |  | — | %
Weighted-average expected volatility | 47 | % |  | 48 | %

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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 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=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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