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Balance Sheet Components | 12 Months Ended
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Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Balance Sheet Components | 4. Balance Sheet Components 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 |
All available-for-sale securities - current held as of December 31, 2016 and December 31, 2015 had contractual maturities of less than one year. All available securities – noncurrent held as of December 31, 2016 had contractual maturities of greater than one year but less than two years. There have been no material realized gains or losses on available-for-sale securities for the periods presented. 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 |
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 |
Depreciation expense for the years ended December 31, 2016, 2015 and 2014 was $317,000, $247,000 and $258,000, respectively. As of December 31, 2016 and 2015, $8,000 and $51,000, respectively, property and equipment, net, were located in Australia. The remainder of the assets are located in the United States. 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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