Balance Sheet Details
 12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Balance Sheet Details Balance Sheet Details
Prepaid and Other Current Assets
Prepaid and other current assets consist of the following (in thousands): 
Years Ended December 31,
20212020
Insurance$1,144 $900 
Selling and marketing related costs
1,134 15,414 
Manufacturing related costs 322 382 
Flex note receivable (1)
— 250 
Other629 1,104 
Total$3,229 $18,050 
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(1) In July 2016, the Company entered into an Asset Purchase Agreement with The Flex Company (Flex), whereby Flex would acquire certain assets and assume certain liabilities associated with the Company’s Softcup line of business (Softcup). Total consideration for the Softcup sale was $1.9 million, with $0.6 million received in cash at closing and the remaining $1.3 million due and payable under a note in favor of the Company (the Flex Note) through January 1, 2021 (the Maturity Date). The Flex Note bears simple interest at a rate of 5.0% per annum on the remaining principal amount outstanding. An annual principal payment of approximately $0.3 million and the annual accrued and unpaid interest are payable each January 1, beginning in 2017 through the Flex Maturity Date. The Flex Note is secured by the Softcup assets and has been recorded at fair value. The Company’s incremental borrowing rate and the stated interest rate of the Flex Note are materially consistent. The note was paid off on January 4, 2021.

Property and Equipment, Net

Property and equipment, net, consists of the following (in thousands):
Years Ended December 31,
Useful Life20212020
Research equipment5 years$653 $623 
Computer equipment and software3 years619 444 
Office furniture5 years881 629 
Leasehold improvements
5 years or less
3,388 1,540 
Construction in-process— 2,407 2,249 
7,948 5,485 
Less: accumulated depreciation(2,174)(1,151)
Total, net$5,774 $4,334 
Depreciation expense was approximately $1.0 million and $0.3 million for the years ended December 31, 2021 and 2020, respectively.
Other Noncurrent Assets

Other noncurrent assets consist of the following (in thousands):
Years Ended December 31,
20212020
Restricted cash included in noncurrent assets$800 $800 
Inventories, long-term241 
Prepaid directors & officers' insurance109 214 
Other53 34 
Total$1,203 $1,048 

Accrued Expenses

Accrued expenses consist of the following (in thousands):
Years Ended December 31,
20212020
Clinical trial related costs$5,294 $1,417 
Selling and marketing related costs1,997 564 
Legal and other professional fees550 1,631 
Manufacturing related costs201 498 
Other328 366 
Total$8,370 $4,476