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Prepaid Expenses and Other Current Assets | 12 Months Ended
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Dec. 31, 2016
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Prepaid Expenses and Other Current Assets | 4. PREPAID EXPENSES AND OTHER CURRENT ASSETS Prepaid expenses and other current assets consisted of the following:
|  | As of December 31, |
|  | 2016 |  |  | 2015 |
|  | (in thousands) |
Deposits |  | $ | 10 |  |  | $ | 67 |
Undelivered laboratory and office equipment |  |  | — |  |  |  | 17 |
Insurance |  |  | 95 |  |  |  | 42 |
Other current assets |  |  | 68 |  |  |  | 195 |
Prepaid expenses and other current assets |  | $ | 173 |  |  | $ | 321 |

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