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Balance Sheet Details | 6 Months Ended
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Jun. 30, 2017
Balance Sheet Details |
Balance Sheet Details | Note 3. Balance Sheet Details Short-term investments Short-term investments consisted of the following (in thousands):
|  | At June 30, 2017 |
|  | Maturity |  | Amortized cost |  | Unrealized |  | Unrealized |  | Estimated |
|  | (in years) |  | or cost |  | gains |  | losses |  | fair value |
U.S. government bonds |  | 1-3 |  | $ | 1,799 |  | $ | - |  | $ | (12) |  | $ | 1,787 |
U.S. government agency bonds |  | less than 3 |  |  | 3,697 |  |  | - |  |  | (12) |  |  | 3,685 |
Bank certificates of deposit |  | less than 1 |  |  | 15,450 |  |  | 8 |  |  | - |  |  | 15,458 |
Commercial paper |  | less than 1 |  |  | 8,327 |  |  | 1 |  |  | - |  |  | 8,328 |
Corporate notes |  | less than 3 |  |  | 53,435 |  |  | 20 |  |  | (39) |  |  | 53,416 |
Asset-backed securities |  | less than 2 |  |  | 7,747 |  |  | 1 |  |  | (2) |  |  | 7,746 |
|  |  |  | $ | 90,455 |  | $ | 30 |  | $ | (65) |  | $ | 90,420 |
|  | At December 31, 2016 |
|  | Maturity |  | Amortized cost |  | Unrealized |  | Unrealized |  | Estimated |
|  | (in years) |  | or cost |  | gains |  | losses |  | fair value |
U.S. government agency bonds |  | 1-3 |  | $ | 9,535 |  | $ | 2 |  | $ | (22) |  | $ | 9,515 |
Bank certificates of deposit |  | less than 2 |  |  | 11,101 |  |  | 13 |  |  | (1) |  |  | 11,113 |
Commercial paper |  | less than 1 |  |  | 17,011 |  |  | 1 |  |  | (2) |  |  | 17,010 |
Corporate notes |  | less than 3 |  |  | 45,178 |  |  | 7 |  |  | (61) |  |  | 45,124 |
Asset-backed securities |  | less than 2 |  |  | 6,503 |  |  | 3 |  |  | — |  |  | 6,506 |
|  |  |  | $ | 89,328 |  | $ | 26 |  | $ | (86) |  | $ | 89,268 |
Accounts receivable, net Accounts receivable consisted of the following (in thousands):
|  | June 30, |  | December 31, |
|  | 2017 |  | 2016 |
Accounts receivable |  | $ | 17,196 |  | $ | 14,800 |
Less allowance for doubtful accounts |  |  | (494) |  |  | (495) |
|  | $ | 16,702 |  | $ | 14,305 |
Inventory, net Inventory consisted of the following (in thousands):
|  | June 30, |  | December 31, |
|  | 2017 |  | 2016 |
Finished goods |  | $ | 3,047 |  | $ | 2,014 |
Work in process |  |  | 2,656 |  |  | 2,105 |
Raw material |  |  | 2,679 |  |  | 2,725 |
|  | $ | 8,382 |  | $ | 6,844 |
Accrued liabilities Accrued liabilities consisted of the following (in thousands):
|  | June 30, |  | December 31,
|  | 2017 |  | 2016
Accrued contract payments (see Note 5) |  | $ | 1,025 |  | $ | 823
Accrued sales commissions |  |  | 382 |  |  | 1,641
Accrued clinical study payments |  |  | 783 |  |  | 1,167
Accrued bonuses |  |  | 4,863 |  |  | 6,122
Accrued vacation benefits |  |  | 1,731 |  |  | 1,382
Accrued Employee Stock Purchase Plan deductions |  |  | 491 |  |  | 4
Other accrued liabilities |  |  | 3,786 |  |  | 2,772
|  | $ | 13,061 |  | $ | 13,911

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