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Organization and Nature of Operations - Summary of Financial Statement Balances and Amounts of VIE and VIE's Subsidiaries (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
Current assets:          
Cash and cash equivalents ¥ 249,310   ¥ 246,863 ¥ 137,840 $ 36,147
Accounts receivable, net 20,298   56,189   2,943
Inventories 72,364   78,075   10,492
Prepayments and other current assets 45,183   29,395   6,550
Non-current assets:          
Property and equipment, net 47,060   33,821   6,823
Right-of-use assets, net 73,482   0   10,654
Intangible assets, net 1,959   745   284
Other non-current assets 1,392   2,367   202
Total assets 530,867   535,434   76,969
Current liabilities:          
Accounts payable 35,456   45,560   5,141
Contract liabilities 19,321   14,831   2,801
Current portion of long-term bank loans 13,154   3,000   1,907
Accrued expenses and current liabilities 97,763   61,851   14,175
Non-current liabilities:          
Long-term bank loans 3,846   17,000   558
Unrecognized tax benefit 5,480   5,480   795
Lease liabilities 69,913       10,136
Total liabilities 406,189   201,388   58,892
Net revenues 44,317 $ 6,425 56,807 180,093  
Net profit (loss) (329,331) (47,748) (313,896) (92,041)  
Net cash (used in) provided by operating activities (173,458) (25,148) (121,629) (151,696)  
Net cash used in investing activities 56,400 8,176 (33,401) (66,209)  
Net cash provided by (used in) financing activities 106,740 15,475 266,947 42,680  
Net (decrease) increase in cash, cash equivalents and restricted cash 2,287 332 106,850 (181,489)  
Variable Interest Entity And Major Subsidaries [Member]          
Current assets:          
Cash and cash equivalents 11,404   8,014   1,653
Accounts receivable, net 202   10,959   29
Inventories 837   839   121
Prepayments and other current assets 3,653   4,302   530
Amounts due from the Company and its subsidiaries 6,911   25,774   1,002
Non-current assets:          
Property and equipment, net 1,273   2,032   185
Right-of-use assets, net 799       116
Intangible assets, net 229   77   33
Other non-current assets 39   97   6
Total assets 25,347   52,094   3,675
Current liabilities:          
Accounts payable 3,100   3,025   449
Contract liabilities 2,027   1,677   294
Current portion of long-term bank loans 5,154   1,000   747
Accrued expenses and current liabilities 19,712   18,053   2,858
Amounts due to the Company and its subsidiaries 55,451   45,991   8,040
Non-current liabilities:          
Long-term bank loans 3,846   9,000   558
Unrecognized tax benefit 588   588   85
Lease liabilities 800       116
Total liabilities 90,678   79,334   $ 13,147
Net revenues 10,147 1,471 28,399 68,372  
Net profit (loss) (38,091) (5,523) (8,534) 25,755  
Net cash (used in) provided by operating activities 4,627 671 (3,482) (5,118)  
Net cash used in investing activities (237) (34) (878) (107)  
Net cash provided by (used in) financing activities (1,000) (145) 5,000    
Net (decrease) increase in cash, cash equivalents and restricted cash 3,390 492 640 (5,225)  
Variable Interest Entity And Major Subsidaries [Member] | Third-party revenue [Member]          
Non-current liabilities:          
Net revenues 6 1 230 35,280  
Variable Interest Entity And Major Subsidaries [Member] | Inter-company revenue [Member]          
Non-current liabilities:          
Net revenues ¥ 10,141 $ 1,470 ¥ 28,169 ¥ 33,092