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Balance Sheet Details | 12 Months Ended
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Dec. 31, 2021
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, 2021 |
​ | ​ | ​ | Maturity | ​ | Amortized cost | ​ | Unrealized | ​ | Unrealized | ​ | Estimated |
​ |  | ​ | (in years) |  | or cost |  | gains |  | losses |  | fair value |
U.S. government agency bonds | ​ | ​ | less than 3 | ​ | $ | 123,803 | ​ | $ | 8 | ​ | $ | (540) | ​ | $ | 123,271 | ​
U.S. government bonds | ​ | ​ | less than 2 | ​ | ​ | 76,765 | ​ | ​ | — | ​ | ​ | (240) | ​ | ​ | 76,525 | ​
Bank certificates of deposit | ​ | ​ | less than 1 | ​ | ​ | 12,500 | ​ | ​ | 1 | ​ | ​ | (9) | ​ | ​ | 12,492 | ​
Commercial paper | ​ | ​ | less than 1 | ​ |  | 2,998 | ​ |  | — | ​ |  | (1) | ​ |  | 2,997 | ​
Corporate notes | ​ | ​ | less than 3 | ​ |  | 55,178 | ​ |  | 37 | ​ |  | (183) | ​ |  | 55,032 | ​
Asset-backed securities | ​ | ​ | less than 2 | ​ |  | 23,761 | ​ |  | 44 | ​ |  | (31) | ​ |  | 23,774 | ​
Municipal bonds | ​ | ​ | less than 3 | ​ | ​ | 19,350 | ​ | ​ | — | ​ | ​ | (98) | ​ | ​ | 19,252 | ​
Total | ​ | ​ | ​ | ​ | $ | 314,355 | ​ | $ | 90 | ​ | $ | (1,102) | ​ | $ | 313,343 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | At December 31, 2020 |
​ | ​ | ​ | Maturity | ​ | Amortized cost | ​ | Unrealized | ​ | Unrealized | ​ | Estimated |
​ |  | ​ | (in years) |  | or cost |  | gains |  | losses |  | fair value |
U.S. government agency bonds | ​ | ​ | less than 3 | ​ | $ | 206,704 | ​ | $ | 223 | ​ | $ | (3) | ​ | $ | 206,924 | ​
Bank certificates of deposit | ​ | ​ | less than 1 | ​ | ​ | 20,700 | ​ | ​ | 8 | ​ | ​ | — | ​ | ​ | 20,708 | ​
Commercial paper | ​ | ​ | less than 1 | ​ |  | 1,500 | ​ |  | — | ​ |  | — | ​ | ​ | 1,500 | ​
Corporate notes | ​ | ​ | less than 3 | ​ |  | 54,866 | ​ |  | 308 | ​ |  | (1) | ​ | ​ | 55,173 | ​
Asset-backed securities | ​ | ​ | less than 2 | ​ |  | 13,290 | ​ |  | 205 | ​ |  | — | ​ |  | 13,495 | ​
Municipal bonds | ​ | ​ | less than 3 | ​ | ​ | 9,954 | ​ | ​ | 21 | ​ | ​ | (3) | ​ | ​ | 9,972 | ​
Total | ​ | ​ | ​ | ​ | $ | 307,014 | ​ | $ | 765 | ​ | $ | (7) | ​ | $ | 307,772 | ​
​ Accounts Receivable, Net Accounts receivable consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ | ​ | 2021 |  | 2020 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts receivable |  | $ | 34,805 | ​ | $ | 37,729 | ​
Allowance for credit losses | ​ |  | (1,367) | ​ |  | (1,670) | ​
​ |  | $ | 33,438 | ​ | $ | 36,059 | ​
​ Inventory Inventory consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ | ​ | 2021 |  | 2020 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Finished goods |  | $ | 6,495 | ​ | $ | 5,346 | ​
Work in process | ​ | ​ | 7,010 | ​ |  | 3,584 | ​
Raw material | ​ | ​ | 9,506 | ​ |  | 6,879 | ​
​ |  | $ | 23,011 | ​ | $ | 15,809 | ​
​ Property and Equipment, Net Property and equipment consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2021 | ​ | 2020 | ​
​ | ​ | ​ | ​ |  | ​ | ​ | ​
Buildings |  | $ | 874 | ​ | $ | 874 | ​
Equipment | ​ | ​ | 19,280 | ​ | ​ | 15,737 | ​
Furniture and fixtures | ​ | ​ | 1,706 | ​ |  | 1,820 | ​
Leasehold improvements | ​ | ​ | 6,152 | ​ |  | 5,851 | ​
Computer equipment and software | ​ | ​ | 3,333 | ​ | ​ | 2,754 | ​
Land | ​ | ​ | 7,068 | ​ | ​ | 7,068 | ​
Construction in progress | ​ | ​ | 51,208 | ​ |  | 5,825 | ​
​ | ​ | ​ | 89,621 | ​ |  | 39,929 | ​
Less accumulated depreciation and amortization | ​ |  | (20,652) | ​ |  | (15,921) | ​
​ |  | $ | 68,969 | ​ | $ | 24,008 | ​
​ Depreciation and amortization expense related to property and equipment was $4.8 million, $6.1 million and $3.7 million for the years ended December 31, 2021, December 31, 2020 and December 31, 2019, respectively. Accrued Liabilities Accrued liabilities consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ | ​ | 2021 | ​ | 2020 |
​ | ​ | ​ | ​ |  | ​ | ​ | ​
Accrued bonuses |  | $ | 17,015 | ​ | $ | 10,815 | ​
Accrued vacation benefits | ​ | ​ | 4,196 | ​ |  | 3,728 | ​
Other accrued liabilities | ​ | ​ | 34,816 | ​ |  | 30,788 | ​
​ | ​ | $ | 56,027 | ​ | $ | 45,331 | ​
​

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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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