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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Schedule of Deferred Revenue Related to Revenue Recognized for Collaborations and Services | The activity related to deferred revenue and the related revenue recognized for collaborations and services is as follows (in thousands):
|  | December 31, |
|  | 2019 |  |  | 2018 |
Deferred revenue: |  |  |  |  |  |  |  |
Beginning balance |  | $ | 47,565 |  |  | $ | 750 |
Upfront and milestone payments |  |  | 25,000 |  |  |  | 55,000 |
Pass through payments |  |  | 6,016 |  |  |  | 2,398 |
Revenue — collaborations and services |  |  | (37,734 | ) |  |  | (10,583 | )
Ending balance |  | $ | 40,847 |  |  | $ | 47,565 |
Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported on the consolidated balance sheets that sum to amounts reported on the consolidated statement of cash flows (in thousands):
|  | December 31, |
|  | 2019 |  |  | 2018 |
Cash and cash equivalents |  | $ | 29,906 |  |  | $ | 71,157 |
Restricted cash |  |  | 316 |  |  |  | 527 |
Total cash, cash equivalents, and restricted cash |  | $ | 30,222 |  |  | $ | 71,684 |
Schedule of Accounts Receivable, Net | Accounts receivable, net consists of the following (in thousands):
|  | December 31, |
|  | 2019 |  |  | 2018 |
Accounts Receivable, gross |  | $ | 6,925 |  |  | $ | 5,198 |
Wholesaler distribution fees and prompt pay discounts |  |  | (1,767 | ) |  |  | (868 | )
Reserve for returns |  |  | (1,645 | ) |  |  | (313 | )
Accounts receivable, net |  | $ | 3,513 |  |  | $ | 4,017 |

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