Balance Sheets - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 19,187,000	$ 26,390,000
Short-term investments	96,397,000	11,689,000
Accounts receivable	7,091,000	8,395,000
Inventory	7,822,000	6,909,000
Prepaid expenses and other current assets	2,319,000	1,179,000
Total current assets	132,816,000	54,562,000
Property and equipment, net	603,000	515,000
Restricted cash	122,000	366,000
Deferred offering costs	0	484,000
Other assets	21,000	23,000
Total assets	133,562,000	55,950,000
Current liabilities
Accounts payable	1,378,000	949,000
Accrued liabilities	7,923,000	6,603,000
Short-term debt	0	2,043,000
Total current liabilities	9,301,000	9,595,000
Deferred rent, noncurrent	911,000	1,301,000
Long-term debt	49,847,000	50,821,000
Redeemable convertible preferred stock warrant liability	0	369,000
Other liabilities	0	274,000
Total liabilities	60,059,000	62,360,000
Commitments and contingencies (Note 5)
Redeemable convertible preferred stock, $0.001 par value - no shares and 60,757,386 shares authorized as of December 31, 2021 and December 31, 2020, respectively; no shares and 16,614,178 shares issued and outstanding as of December 31, 2021 and December 31, 2020, respectively (Liquidation value $0 and $227,755 as of December 31, 2021 and December 31, 2020, respectively)	0	141,422,000
Stockholders’ equity (deficit)
Preferred stock, $0.001 par value, 10,000,000 shares authorized; no shares issued and outstanding as of December 31, 2021 and December 31, 2020	0	0
Common stock, $0.001 par value - 200,000,000 and 74,636,348 shares authorized as of December 31, 2021 and December 31, 2020, respectively; 24,452,999 and 314,096 shares issued and outstanding as of December 31, 2021 and December 31, 2020, respectively	24,000	0
Additional paid-in-capital	497,522,000	239,826,000
Accumulated other comprehensive income (loss)	(272,000)	33,000
Accumulated deficit	(423,771,000)	(387,691,000)
Total stockholders’ equity (deficit)	73,503,000	(147,832,000)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit)	$ 133,562,000	$ 55,950,000

Warrant Liability, Noncurrent

No definition available.

Name:	npce_WarrantLiabilityNoncurrent
Namespace Prefix:	npce_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).