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Balance Sheet Details | 12 Months Ended
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Dec. 31, 2019
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, 2019 |
​ | ​ | ​ | Maturity | ​ | Amortized cost | ​ | Unrealized | ​ | Unrealized | ​ | Estimated |
​ |  | ​ | (in years) |  | or cost |  | gains |  | losses |  | fair value |
Bank certificates of deposit | ​ | ​ | less than 1 | ​ | ​ | 12,999 | ​ | ​ | 7 | ​ | ​ | — | ​ | ​ | 13,006 | ​
Commercial paper | ​ | ​ | less than 1 | ​ |  | 7,475 | ​ |  | 8 | ​ |  | — | ​ |  | 7,483 | ​
Corporate notes | ​ | ​ | less than 3 | ​ |  | 65,354 | ​ |  | 295 | ​ |  | (10) | ​ |  | 65,639 | ​
Asset-backed securities | ​ | ​ | less than 3 | ​ |  | 25,333 | ​ |  | 99 | ​ |  | (7) | ​ |  | 25,425 | ​
Total | ​ | ​ | ​ | ​ | $ | 111,161 | ​ | $ | 409 | ​ | $ | (17) | ​ | $ | 111,553 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | 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 | ​
​ Accounts Receivable, Net Accounts receivable consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ | ​ | 2019 |  | 2018 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts receivable |  | $ | 39,657 | ​ | $ | 19,333 | ​
Allowance for doubtful accounts | ​ |  | (1,240) | ​ |  | (660) | ​
​ |  | $ | 38,417 | ​ | $ | 18,673 | ​
​ Inventory, Net Inventory consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ | ​ | 2019 |  | 2018 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Finished goods |  | $ | 32,108 | ​ | $ | 4,256 | ​
Work in process | ​ | ​ | 3,884 | ​ |  | 3,197 | ​
Raw material | ​ | ​ | 6,586 | ​ |  | 5,829 | ​
​ |  | $ | 42,578 | ​ | $ | 13,282 | ​
​ Property and Equipment, Net Property and equipment consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2019 | ​ | 2018 | ​
​ | ​ | ​ | ​ |  | ​ | ​ | ​
Buildings |  | $ | 874 | ​ | $ | 874 | ​
Equipment | ​ | ​ | 13,782 | ​ | ​ | 10,306 | ​
Furniture and fixtures | ​ | ​ | 1,643 | ​ |  | 1,570 | ​
Leasehold improvements | ​ | ​ | 6,384 | ​ |  | 4,792 | ​
Computer equipment and software | ​ | ​ | 2,808 | ​ | ​ | 2,232 | ​
Land | ​ | ​ | 7,068 | ​ | ​ | 7,068 | ​
Construction in progress | ​ | ​ | 1,627 | ​ |  | 1,231 | ​
​ | ​ | ​ | 34,186 | ​ |  | 28,073 | ​
Less accumulated depreciation and amortization | ​ |  | (12,130) | ​ |  | (8,920) | ​
​ |  | $ | 22,056 | ​ | $ | 19,153 | ​
​ Depreciation and amortization expense related to property and equipment was $3.7 million, $3.1 million and $2.1 million for the years ended December 31, 2019, December 31, 2018 and December 31, 2017, respectively. Accrued Liabilities Accrued liabilities consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ | ​ | 2019 | ​ | 2018 |
​ | ​ | ​ | ​ |  | ​ | ​ | ​
Accrued bonuses |  | $ | 13,525 | ​ | $ | 8,604 | ​
Accrued legal expenses | ​ | ​ | 3,957 | ​ | ​ | 2,466 | ​
Accrued vacation benefits | ​ | ​ | 2,784 | ​ |  | 2,446 | ​
Accrued restructuring costs | ​ | ​ | 4,096 | ​ | ​ | — | ​
Accrued liability for cash-settled options | ​ | ​ | 6,685 | ​ | ​ | — | ​
Other accrued liabilities | ​ | ​ | 20,872 | ​ |  | 10,448 | ​
​ | ​ | $ | 51,919 | ​ | $ | 23,964 | ​
​

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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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