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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Schedule of reconciliation of liabilities measured at fair value | The following table provides a reconciliation of liabilities measured at fair value using significant unobservable inputs (Level 3) for the year ended December 31, 2015 (in thousands):
| Common Stock Warrant Liabilities
Balance at December 31, 2013 | $ | — |
Issuance | 11,280 |
Changes in fair value | (2,578 | )
Balance at December 31, 2014 | 8,702 |
Issuance | — |
Changes in fair value | (8,015 | )
Balance at December 31, 2015 | $ | 687 |
Summary of assumptions used to compute share-based compensation costs for stock options granted | The assumptions used to compute the share-based compensation costs for the stock options granted during the years ended December 31, 2015, 2014 and 2013 are as follows:
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Risk-free interest rate | 1.6-1.8% |  |  | 1.8-1.9% |  |  | 1.1-1.8% |
Expected dividend yield | — |  |  | — |  |  | — |
Weighted average expected life (years) | 5.4-5.5 |  |  | 5.4-5.5 |  |  | 5.3-5.5 |
Volatility | 59-68% |  |  | 60-71% |  |  | 75-76% |
Summary of compensation cost for stock-based compensation arrangements | The compensation cost that has been included in the Company’s consolidated statement of operations for all stock-based compensation arrangements is detailed as follows (in thousands):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Cost of revenues | $ | 72 |  |  | $ | 274 |  |  | $ | 228 |
Research and development | 286 |  |  | 2,080 |  |  | 719 |
Sales and marketing | 359 |  |  | 470 |  |  | 459 |
General and administrative | 1,926 |  |  | 1,730 |  |  | 2,672 |
Total | $ | 2,643 |  |  | $ | 4,554 |  |  | $ | 4,078 |
Schedule of diluted earning per share | For purposes of this calculation, common stock subject to repurchase by the Company, options and warrants are considered to be common stock equivalents and are only included in the calculation of diluted earnings per share when their effect is dilutive. The following table sets forth the computation of basic and diluted loss per share (in thousands, except per share data):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Numerator: |  |  |  |  |
Net loss for basic earnings per share | $ | (178,676 | ) |  | $ | (12,882 | ) |  | $ | (82,227 | )
Decrease in fair value of warrants | — |  |  | (2,578 | ) |  | — |
Diluted net loss attributable to common stockholders | $ | (178,676 | ) |  | $ | (15,460 | ) |  | $ | (82,227 | )
Denominator: |  |  |  |  |
Weighted average common shares outstanding | 100,385 |  |  | 98,138 |  |  | 97,111 |
Weighted average unvested common shares subject to repurchase | (811 | ) |  | (791 | ) |  | (876 | )
Weighted average common shares outstanding—basic | 99,574 |  |  | 97,347 |  |  | 96,235 |
Effect of dilutive securities: |  |  |  |  |
Conversion of preferred stock | — |  |  | — |  |  | — |
Options | — |  |  | — |  |  | — |
Warrants | — |  |  | 388 |  |  | — |
Weighted average common shares outstanding—diluted | 99,574 |  |  | 97,735 |  |  | 96,235 |
Net loss per share: |  |  |  |  |
Basic | $ | (1.79 | ) |  | $ | (0.13 | ) |  | $ | (0.85 | )
Diluted | $ | (1.79 | ) |  | $ | (0.16 | ) |  | $ | (0.85 | )
Weighted-average anti-dilutive securities not included in diluted net loss per share | The anti-dilutive securities not included in diluted net loss per share were as follows (in thousands):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Options to purchase common stock | 7,941 |  |  | 7,057 |  |  | 4,597 |
Warrants to purchase common stock | 11,544 |  |  | 725 |  |  | 594 |
Unvested restricted stock awards | 811 |  |  | 791 |  |  | 876 |
| 20,296 |  |  | 8,573 |  |  | 6,067 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 + Details
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