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Balance Sheet Components | 6 Months Ended
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Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Balance Sheet Components | Balance Sheet Components Inventory As of June 30, 2019 and December 31, 2018, inventory consisted entirely of finished goods. Property and Equipment, net (in thousands):
| June 30, |  | December 31,
| 2019 |  | 2018
Machinery and equipment | $ | 4,097 |  |  | $ | 3,785 |
Construction in progress | 854 |  |  | 730 |
Computer and office equipment | 440 |  |  | 407 |
Leasehold improvements | 497 |  |  | 448 |
Furniture and fixtures | 151 |  |  | 148 |
| 6,039 |  |  | 5,518 |
Less: Accumulated depreciation and amortization | (3,507 | ) |  | (3,364 | )
| $ | 2,532 |  |  | $ | 2,154 |
Depreciation expense was $0.2 million and $0.2 million for the three months ended June 30, 2019 and 2018, respectively and $0.4 million and $0.4 million for the six months ended June 30, 2019 and 2018, respectively. Accrued Liabilities and Other (in thousands):
| June 30, |  | December 31,
| 2019 |  | 2018
Accrued compensation and related expenses | $ | 4,987 |  |  | $ | 5,425 |
Accrued interest | 1,163 |  |  | — |
Accrued professional services | 421 |  |  | 583 |
Sales tax payable | 349 |  |  | 388 |
Liability for early exercise of unvested stock options | 210 |  |  | 331 |
Others | 339 |  |  | 133 |
| $ | 7,469 |  |  | $ | 6,860 |

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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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