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Balance Sheet Components | 9 Months Ended
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Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Balance Sheet Components | Balance Sheet Components Property and Equipment, net (in thousands):
| September 30, |  | December 31,
| 2018 |  | 2017
Machinery and equipment | $ | 3,670 |  |  | $ | 3,428 |
Construction in progress | 660 |  |  | 879 |
Computer and office equipment | 325 |  |  | 310 |
Leasehold improvements | 443 |  |  | 272 |
Furniture and fixtures | 146 |  |  | 29 |
| 5,244 |  |  | 4,918 |
Less: Accumulated depreciation and amortization | (3,196 | ) |  | (3,022 | )
| $ | 2,048 |  |  | $ | 1,896 |
Depreciation expense were $0.2 million and $0.5 million for the three and nine months ended September 30, 2018, respectively, and $0.3 million and $0.8 million for the three and nine months ended September 30, 2017, respectively. Accrued Liabilities and Other (in thousands):
| September 30, |  | December 31,
| 2018 |  | 2017
Accrued compensation, travel and related expenses | $ | 3,968 |  |  | $ | 3,732 |
Accrued interest | 1,176 |  |  | 831 |
Accrued professional services | 858 |  |  | 341 |
Sales tax payable | 461 |  |  | 466 |
Liability for early exercise of unvested stock options | 359 |  |  | 65 |
Sales and warranty reserves | 52 |  |  | 149 |
Others | 278 |  |  | 140 |
| $ | 7,152 |  |  | $ | 5,724 |

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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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