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Balance Sheet Details | 12 Months Ended
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Dec. 31, 2018
Balance Sheet Details |
Balance Sheet Details | Note 3. Balance Sheet Details Short-term investments Short-term investments consisted of the following (in thousands):
|  |  |  |  | At December 31, 2018 |
|  |  | Maturity |  | Amortized cost |  | Unrealized |  | Unrealized |  | Estimated |
|  |  | (in years) |  | or cost |  | gains |  | losses |  | fair value |
U.S. government bonds |  |  | less than 1 |  | $ | 1,300 |  | $ | — |  | $ | (3) |  | $ | 1,297 |
U.S. government agency bonds |  |  | less than 1 |  |  | 1,994 |  |  | — |  |  | (12) |  |  | 1,982 |
Bank certificates of deposit |  |  | less than 2 |  |  | 15,201 |  |  | 2 |  |  | (3) |  |  | 15,200 |
Commercial paper |  |  | less than 1 |  |  | 9,597 |  |  | 1 |  |  | (5) |  |  | 9,593 |
Corporate notes |  |  | less than 3 |  |  | 60,923 |  |  | 24 |  |  | (194) |  |  | 60,753 |
Asset-backed securities |  |  | less than 3 |  |  | 21,918 |  |  | 18 |  |  | (94) |  |  | 21,842 |
Total |  |  |  |  | $ | 110,933 |  | $ | 45 |  | $ | (311) |  | $ | 110,667 |
|  |  |  |  | At December 31, 2017 |
|  |  | Maturity |  | Amortized cost |  | Unrealized |  | Unrealized |  | Estimated |
|  |  | (in years) |  | or cost |  | gains |  | losses |  | fair value |
U.S government bonds |  |  | less than 2 |  | $ | 1,799 |  | $ | — |  | $ | (17) |  | $ | 1,782 |
U.S. government agency bonds |  |  | less than 2 |  |  | 2,698 |  |  | — |  |  | (17) |  |  | 2,681 |
Bank certificates of deposit |  |  | less than 1 |  |  | 10,300 |  |  | 1 |  |  | (3) |  |  | 10,298 |
Commercial paper |  |  | less than 1 |  |  | 11,598 |  |  | — |  |  | (5) |  |  | 11,593 |
Corporate notes |  |  | less than 3 |  |  | 51,532 |  |  | 6 |  |  | (121) |  |  | 51,417 |
Asset-backed securities |  |  | less than 3 |  |  | 16,796 |  |  | — |  |  | (61) |  |  | 16,735 |
Total |  |  |  |  | $ | 94,723 |  | $ | 7 |  | $ | (224) |  | $ | 94,506 |
Accounts receivable, net Accounts receivable consisted of the following (in thousands):
|  | December 31, |
|  | 2018 |  | 2017 |
Accounts receivable |  | $ | 19,333 |  | $ | 17,248 |
Allowance for doubtful accounts |  |  | (660) |  |  | (592) |
|  | $ | 18,673 |  | $ | 16,656 |
Inventory, net Inventory consisted of the following (in thousands):
|  | December 31, |
|  | 2018 |  | 2017 |
Finished goods |  | $ | 4,256 |  | $ | 4,225 |
Work in process |  |  | 3,197 |  |  | 2,368 |
Raw material |  |  | 5,829 |  |  | 4,629 |
|  | $ | 13,282 |  | $ | 11,222 |
Property and equipment, net Property and equipment consisted of the following (in thousands):
|  | December 31, |
|  | 2018 |  | 2017 |
Buildings |  | $ | 874 |  | $ | 874 |
Equipment |  |  | 10,306 |  |  | 8,311 |
Furniture and fixtures |  |  | 1,570 |  |  | 1,382 |
Leasehold improvements |  |  | 4,792 |  |  | 4,568 |
Computer equipment and software |  |  | 2,232 |  |  | 1,980 |
Land |  |  | 7,068 |  |  | — |
Construction in progress |  |  | 1,231 |  |  | 1,134 |
|  |  | 28,073 |  |  | 18,249 |
Less accumulated depreciation and amortization |  |  | (8,920) |  |  | (6,455) |
|  | $ | 19,153 |  | $ | 11,794 |
Depreciation and amortization expense related to property and equipment was $3.1 million, $2.1 million and $1.1 million for the years ended December 31, 2018, December 31, 2017 and December 31, 2016, respectively. Accrued liabilities Accrued liabilities consisted of the following (in thousands):
|  | December 31, |
|  | 2018 |  | 2017 |
Accrued bonuses |  | $ | 8,604 |  | $ | 9,106 |
Accrued legal expenses |  |  | 2,466 |  |  | 591 |
Accrued vacation benefits |  |  | 2,446 |  |  | 2,121 |
Accrued Employee Stock Purchase Plan liability |  |  | 1,154 |  |  | 1,517 |
Other accrued liabilities |  |  | 9,294 |  |  | 7,114 |
|  | $ | 23,964 |  | $ | 20,449 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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