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Nature of Operations and Summary of Significant Accounting Policies (Details Narrative) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 02, 2019 | Jan. 02, 2018 | Oct. 16, 2017 | Dec. 31, 2016
Cash, cash equivalents and short-term investments | $ 129,258,000 |  |  |  |  |  |
Net assets | 178,430,000 |  |  |  |  |  |
Net cash used in operating activities | (62,820,000) | $ (39,111,000) | $ (22,655,000) |  |  |  |
Allowance for doubtful accounts receivable |  |  |  |  |  |  |
Receivables |  | 81,000 |  |  |  |  |
Right-of-use lease assets | 8,047,000 |  |  |  |  |  |
Operating lease liability | 7,950,000 |  |  |  |  |  |
Goodwill | 32,466,000 | 32,466,000 |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  |
Stockholders' equity | 178,430,000 | 134,045,000 | 170,098,000 |  | $ 6,300,000 |  | $ 99,098,000
Deferred revenue | 296,000 | 296,000 | 2,600,000 |  | 2,600,000 |  |
Accumulated deficit | (486,470,000) | (410,188,000) |  |  | 2,600,000 |  |
Grants Receivable | 5,700,000 | 5,700,000 |  |  |  |  |
Aggregate amount to the performance obligations | 300,000 | 300,000 |  |  |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |
Right-of-use lease assets |  |  |  | $ 8,900,000 |  |  |
Operating lease liability |  |  |  | $ 8,900,000 |  |  |
MPS IIIA [Member] |  |  |  |  |  |  |
Value in installments for the advancement |  |  |  |  |  | $ 13,900,000 |
MPS IIIB [Member] |  |  |  |  |  |  |
Value in installments for the advancement |  |  |  |  |  | $ 13,900,000 |
Foundation Revenues [Member] |  |  |  |  |  |  |
Deferred revenue | $ 0 | $ 2,800,000 |  |  |  |  |
Licenses [Member] |  |  |  |  |  |  |
Deferred revenue |  |  | $ 3,700,000 |  | 3,700,000 |  |
Accumulated deficit |  |  |  |  | $ 3,700,000 |  |

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