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OTHER BALANCE SHEET DETAILS (Tables) | 12 Months Ended
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Dec. 31, 2018
Other Balance Sheet Details [Abstract] |
Summary of Inventory | Inventory consisted of the following:
| December 31, |
(in thousands) | 2018 |  |  | 2017 |
Raw materials | $ | 7,855 |  |  | $ | — |
Work in process |  | 2,208 |  |  | 491 |
Finished goods |  | 801 |  |  |  | 533 |
Total inventory | $ | 10,864 |  |  | $ | 1,024 |
Property and Equipment | Property and equipment, net, consisted of the following:
| December 31, |
(in thousands) | 2018 |  |  | 2017 |
Tenant improvements | $ | 19,857 |  |  | $ | 2,019 |
Furniture and fixtures |  | 2,968 |  |  |  | 1,303 |
Scientific equipment |  | 28,163 |  |  |  | 26,248 |
Computer equipment |  | 11,152 |  |  |  | 8,821 |
|  | 62,140 |  |  |  | 38,391 |
Less accumulated depreciation |  | (28,271 | ) |  |  | (27,580 | )
Property and equipment, net | $ | 33,869 |  |  | $ | 10,811 |
Accounts Payable and Accrued Liabilities | Accounts payable and accrued liabilities consisted of the following:
| December 31, |
(in thousands) | 2018 |  |  | 2017 |
Accrued employee related costs | $ | 27,341 |  |  | $ | 24,901 |
Accounts payable |  | 13,801 |  |  |  | 5,648 |
Accrued development costs |  | 7,069 |  |  |  | 4,799 |
Other accrued liabilities |  | 38,166 |  |  |  | 18,172 |
Total accounts payable and accrued liabilities | $ | 86,377 |  |  | $ | 53,520 |

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