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Restricted Stock Awards (Tables) - Restricted stock | 6 Months Ended
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Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Restricted Stock Activity | A summary of unvested restricted stock awards outstanding as of, and changes made during, the six months ended June 30, 2018, is presented below (shares in thousands):
| Restricted Shares |  | Weighted Average Grant Price
Unvested restricted stock outstanding, December 31, 2017 | 341 |  |  | $ | 1.06 |
Vested | (228 | ) |  | 0.84 |
Unvested restricted stock outstanding, June 30, 2018 | 113 |  |  | $ | 1.49 |
Summary of Compensation Expense | Stock-based compensation expense related to restricted stock awards is allocated as follows (in thousands):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Cost of revenue | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 4 |
Research and development | — |  |  | 1 |  |  | — |  |  | 2 |
General and administrative | 2 |  |  | 12 |  |  | 12 |  |  | 24 |
| $ | 2 |  |  | $ | 15 |  |  | $ | 12 |  |  | $ | 30 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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