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Other Balance Sheet Accounts Details | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Other Balance Sheet Accounts Details | Other Balance Sheet Accounts Details Allowance for Doubtful Accounts The following table presents the changes in the Company’s allowance for doubtful accounts (in thousands):
| December 31, 2020 |  | December 31, 2019
Allowance for doubtful accounts, beginning balance | $ | 52 |  |  | $ | 319 |
Increase (decrease) of provision | 78 |  |  | (72) |
Write-offs | (89) |  |  | (195) |
Allowance for doubtful accounts, ending balance | $ | 41 |  |  | $ | 52 |
Inventory Inventory consisted of the following (in thousands):
| December 31, 2020 |  | December 31, 2019
Raw materials | $ | 8,395 |  |  | $ | 9,495 |
Finished goods | 12,335 |  |  | 12,889 |
Total inventory | $ | 20,730 |  |  | $ | 22,384 |
Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consisted of the following (in thousands):
| December 31, 2020 |  | December 31, 2019
Prepaid expenses | $ | 3,818 |  |  | $ | 6,163 |
Deferred contract acquisition costs | 5,345 |  |  | 6,231 |
Other | 3,227 |  |  | 2,673 |
Prepaid expenses and other current assets | $ | 12,390 |  |  | $ | 15,067 |
Property and Equipment, Net Property and equipment, net, consisted of the following (in thousands):
| Useful Life |  | December 31, 2020 |  | December 31, 2019
| (in years) |  |  |  |
Equipment | 1-3 |  | $ | 25,286 |  |  | $ | 22,702 |
Software | 1-3 |  | 765 |  |  | 726 |
Furniture and fixtures | 1-3 |  | 652 |  |  | 459 |
Leasehold improvements | 1-7 |  | 3,616 |  |  | 5,440 |
Construction in progress |  |  | 1,677 |  |  | — |
Property and equipment, gross |  |  | 31,996 |  |  | 29,327 |
Less: accumulated depreciation |  |  | (24,108) |  |  | (21,671) |
Property and equipment, net |  |  | $ | 7,888 |  |  | $ | 7,656 |
Depreciation expense on property and equipment was $4.2 million, $5.0 million and $6.4 million for the years ended December 31, 2020, 2019 and 2018, respectively. Intangible Assets Purchased intangible assets, net, consisted of the following (in thousands):
| December 31, 2020 |  | December 31, 2019
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Net
Developed technology | $ | 5,050 |  |  | $ | (4,545) |  |  | $ | 505 |  |  | $ | 5,050 |  |  | $ | (3,535) |  |  | $ | 1,515 |
Patents | 2,936 |  |  | (2,579) |  |  | 357 |  |  | 2,936 |  |  | (2,146) |  |  | 790 |
Total | $ | 7,986 |  |  | $ | (7,124) |  |  | $ | 862 |  |  | $ | 7,986 |  |  | $ | (5,681) |  |  | $ | 2,305 |
Amortization expense related to purchased intangible assets was $1.4 million for each of the years ended December 31, 2020, 2019 and 2018. Purchased intangible assets will be amortized over a remaining weighted average useful life of 0.6 years. Future amortization expense for purchased intangible assets as of December 31, 2020 is as follows (in thousands):
Fiscal Year |  |
2021 |  | 862 |
Other non-current assets Other non-current assets consisted of the following (in thousands):
| December 31, 2020 |  | December 31, 2019
Right-of-use assets | $ | 28,240 |  |  | $ | 33,014 |
Deferred contract acquisition costs | 3,714 |  |  | 3,297 |
Deposits | 2,746 |  |  | 2,338 |
Net deferred tax assets | 944 |  |  | 1,171 |
Other | 2,807 |  |  | 2,026 |
Total other non-current assets | $ | 38,451 |  |  | $ | 41,846 |
Accrued Liabilities Accrued liabilities consisted of the following (in thousands):
| December 31, 2020 |  | December 31, 2019
Accrued compensation and benefits | $ | 19,725 |  |  | $ | 12,227 |
Accrued tax liabilities | 3,748 |  |  | 4,354 |
Lease liabilities | 5,260 |  |  | 5,109 |
Other | 8,197 |  |  | 6,066 |
Total accrued liabilities | $ | 36,930 |  |  | $ | 27,756 |
Other Non-Current Liabilities Other non-current liabilities consisted of the following (in thousands):
| December 31, 2020 |  | December 31, 2019
Lease liabilities | $ | 23,498 |  |  | $ | 28,046 |
Other | 859 |  |  | 708 |
Total other non-current liabilities | $ | 24,357 |  |  | $ | 28,754 |

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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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