XML 75 R55.htm IDEA: XBRL DOCUMENT v3.22.1
Income Taxes - Deferred tax assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets    
Net operating loss carryforwards $ 47,737 $ 39,937
Research and development credits 623 747
Depreciation and amortization (89) 239
Accrued expenses and other 1,356 611
Inventory reserve 171 205
Gross deferred tax asset 49,798 41,739
Valuation allowance (49,798) (41,739)
Net deferred tax asset $ 0 $ 0