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Balance Sheet Components (Tables) | 12 Months Ended
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Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Summary of Cash Equivalents and Available-for-sale Securities | Cash equivalents and available-for-sale securities consisted of the following (in thousands):
|  | December 31, 2016 |
|  | Amortized |  |  | Gross Unrealized |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Money market funds |  | $ | 11,270 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,270 |
Corporate bonds |  |  | 21,886 |  |  |  | — |  |  |  | (45 | ) |  |  | 21,841 |
Commercial paper |  |  | 10,769 |  |  |  | — |  |  |  | — |  |  |  | 10,769 |
Government bonds |  |  | 41,316 |  |  |  | 2 |  |  |  | (29 | ) |  |  | 41,289 |
Total cash equivalents and available-for-sale securities |  | $ | 85,241 |  |  | $ | 2 |  |  | $ | (74 | ) |  | $ | 85,169 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 18,504 |
Available-for-sale securities - current |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56,515 |
Available-for-sale securities - noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,150 |
Total cash equivalents and available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 85,169 |
|  | December 31, 2015 |
|  | Amortized |  |  | Gross Unrealized |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Money market funds |  | $ | 2,136 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,136 |
Corporate bonds |  |  | 7,373 |  |  |  | — |  |  |  | (5 | ) |  |  | 7,368 |
Commercial paper |  |  | 500 |  |  |  | — |  |  |  | — |  |  |  | 500 |
Total cash equivalents and available-for-sale securities |  | $ | 10,009 |  |  | $ | — |  |  | $ | (5 | ) |  | $ | 10,004 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 2,136 |
Available-for-sale securities - current |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,868 |
Total cash equivalents and available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 10,004 |
Summary of Prepaid Expenses and Other Current Assets | Prepaid expenses and other current assets consisted of the following (in thousands):
|  | December 31, |
|  | 2016 |  |  | 2015 |
Prepaid clinical and research related expenses |  | $ | 2,488 |  |  | $ | 1,253 |
Other |  |  | 906 |  |  |  | 305 |
Prepaid expenses and other current assets |  | $ | 3,394 |  |  | $ | 1,558 |
Summary of Property and Equipment Net | Property and equipment, net consisted of the following (in thousands):
|  | December 31, |
|  | 2016 |  |  | 2015 |
Laboratory equipment |  | $ | 1,650 |  |  | $ | 1,452 |
Furniture and computer equipment |  |  | 163 |  |  |  | 140 |
Leasehold improvements |  |  | 62 |  |  |  | 48 |
Total property and equipment |  |  | 1,875 |  |  |  | 1,640 |
Less: accumulated depreciation and amortization |  |  | (1,313 | ) |  |  | (1,031 | )
Property and equipment, net |  | $ | 562 |  |  | $ | 609 |
Summary of Accrued Expenses and Other Payables | Accrued expenses and other payables consisted of the following (in thousands):
|  | December 31, |
|  | 2016 |  |  | 2015 |
Accrued clinical and research related expenses |  | $ | 3,617 |  |  | $ | 976 |
Accrued employee related expenses |  |  | 1,420 |  |  |  | 754 |
Other |  |  | 235 |  |  |  | 149 |
Total accrued expenses and other payables |  | $ | 5,272 |  |  | $ | 1,879 |

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